Windows.UI.Xaml.Markup.XamlParseException UWP

Stop C00002lA Fatal System Error- What is it?

C00002lA Fatal System Error is a blue screen of death error that may occur when you start your Windows NT 4.0 based computer. This error causes the screen to turn blue and the system also shuts down. The stop C000021A error message is displayed in the following format:

Stop c000021a {Fatal System Error} The session manager initialization system process terminated unexpectedly with a status of 0xc0000017 (0x00000000, 0x0000000) The system has been shut down.

Error Causes

The stop C000021A error occurs when either Crsrss.exe or Winlogon.exe fails. When the Windows NT kernel identifies that either of these processes has failed, it stops and the error code stop C000021A appears on the computer screen. Here are some of the underlying causes for the stop C0000021A error:

• The incompatible third-party program
• Hard disk issues
• Service pack installation has failed
• Mismatched system files have been installed
• Bad and invalid registry keys

Further Information and Manual Repair

To resolve the stop C000021A Fatal System Error on your PC try the following solutions:

• Remove Incompatible Third Party Programs

If the error occurred after you recently installed a new program, then it is advisable to remove that program. The error occurs due to the incompatibility of the program. To remove the program go to the start menu and click on the control panel. Now click on Add/Remove Program tab and double click on the program name that you recently installed and remove it from the list. Once removed, not reboot your PC. Reinstall a compatible program and run it. It is most likely to resolve the issue. However, if the stop C000021A error still occurs, then it means the problem is critical. It is related to the registry.

• Repair and Restore the Registry

This procedure is slightly long and tricky. To try it, you need to be technically sound. Here’s what you have to do: first create a parallel installation of Windows NT. Start your PC to the parallel installation and then open the Registry Editor. On the Registry Editor’s Windows menu click HKEY_LOCAL_MACHINE on Local Machine and then click Load Hive. Now type the path %systemroot%system32configsystem into the System hive of the prior installation. Then click open. Here you will be prompted to enter the name of the key, type TEST. Note the setting for the current DWord value in the preceding registry key. This is 0x1 and is denoted by CURRENT:Reg_Dword: 0x1. This value indicated that the Current Control Set for your original Windows NT installation corresponds to ControlSet001 in this window. Now if the value is 2, it indicated that the Current Control Set corresponds to ControlSet002. Now locate the following registry key: HKEY_LOCAL_MACHINETESTControlSetXXXControlSession Manager. XXX is the Current Control Set Value. And delete any pending file rename operation entries. Then click TEST hive and then click Unload Hive. After that again repeat the process, open the registry menu and click load hive, here type the path %systemroot%system32configSoftware to the Software hive of the prior installation and then click open. Now you type TEST 2 when you are prompted for the name of the key. Remove any pending file rename operations entries in the following registry keys: HKEY_LOCAL_MACHINETEST2MicrosoftWindowsCurrentVersionRunOnce HKEY_LOCAL_MACHINETEST2MicrosoftWindowsCurrentVersionRunOnceEx Now click TEST2 hive and then click unload hive. Quit the Registry Editor and then restart your original installation. This will resolve the stop C000021A error.

One of the preferred ways to upgrade Windows 10 is by creating a bootable USB drive. However, you might change your mind when you encounter an error during the Windows 10 Setup that says, “We can’t find a USB flash drive”. Worry not for this error can be fixed using some suggestions that will be provided in this post. The funning thing about this error in Windows setup is that the computer says it’s not there when it’s clearly there. To fix this problem, you need to check if the USB device is accessible on your computer or you can also try a different USB device. In addition, you could check if there are any issues with both the USB 3.0 and USB 2.0 ports as it could be the reason why you’re getting the error or fix the bad sectors in the USB drive as well as see if the USB drive is set as the primary drive.

Option 1 – Try to check if the USB is accessible on your PC

The first thing you can do to resolve the problem is to check if you can access your USB device from your computer. All you have to do is open File Explorer and check if the USB device is listed there or not.

Option 2 – Try to connect a different USB device

The next thing you can do to fix the error is to try connecting a different USB device, specifically the one that has more significant storage space. You also have to make sure that it’s working on a different PC.

Option 3 – Fix any issues with the USB 3.0 and 2.0 ports

Although the USB 3.0 ports are compatible with the USB 2.0 ports, it does not necessarily mean that there wouldn’t be any problem when you use them which is why it’s best to fix any issues in them or better yet, use a compatible drive.

Option 4 – Try to fix the bad sectors in the USB drive via CHKDSK

When it comes to some issues concerning the hard drive or removable devices, there is a utility in Windows that might help which is called “chkdsk”. To use it, follow the steps below.

• Tap the Win + S keys to open the Search box.
• Then type “command prompt” in the field and from the search results that appear, right-click on Command Prompt and select “Run as administrator”.
• After opening an elevated command prompt, copy and paste the following command and hit Enter:

CHKDSK [volume [[path] filename]] [/F] [/V] [/R] [/X] [/C] [: size]]

Note: In the command given above, “[/F]” will try to fix the system errors while “[/R]” will be the one to fix the bad sectors.

• Now if you are prompted to run CHKDSK after your reboot your PC, just tap Y and reboot your PC.
• If CHKDSK is not able to find any errors, tap the Win + E keys and navigate the access window. From there, right-click on the concerned drive and click on Properties.
• After opening Properties, click on the tab Tools and then click on the “Check” button under the Error-checking section.
• Wait until the process is completed and then restart your computer.

Option 5 – Try checking if the USB is set as the primary drive

You might also want to check if the USB drive is set as the primary drive because if it is, then it won’t appear on the list. It could also be that the USB drive has a primary disk in it. To undo it, you need to use the DISKPART utility.

• In the Start Search, type “command prompt” and right-click on Command Prompt from the search results, and then select the “Run as administrator” option.
• Next, execute the “diskpart” command to initiate the DISKPART utility.
• After that, type the “list disk” command and tap Enter to display the list of disks on the computer. You have to take note of the drive number or letter of the concerned USB drive.
• Once done, type the “select disk <X>” command where X is the drive letter or number and tap Enter.
• Then execute the “list partition” command to see the list of all the partitions in your computer. It should be listed as 0, 1, or 2. 0 is the primary partition.
• Now type the “select partition 0” command and tap Enter and then type “delete partition” to delete the selected partition.
• You can do the same to the other partitions as well and when you’re done, execute the format command to turn the USB drive into a standard one.

Quest 2 has been crowned as the best overall VR headset by many websites, and to be honest it is really a great piece of equipment deserving of every praise it gets. It seems that Meta feels that it can do better so the new upcoming Quest Pro is upgraded and a new line of VR sets from this company. The economic standard Quest line will not be shut down and it will still remain as an economic version of Meta's VR product line.

Quest Pro will be added as a new line of the better product line with better performance and better quality. It is the first VR headset that is packing Qualcomm Snapdragon XR3+ Gen 1 chipset, 12GB of RAM, 256GB of internal storage, and 10 high-resolution sensors. Of course, this much power and improvement come with a higher price tag, this time that price tag is $1,499.99.

The new VR headset promises industry-leading visuals with a new optical stack instead of Fresnel lenses in Meta Quest 2 with thin-layer pancake optics that fold light reducing the depth of the optical module by 40% and at the same provides clear and sharp visuals.

The headset will give display more vivid colors, richer colors, and higher contrast by incorporating local dimming and quantum dot technology. It composes of specialized backlight hardware accompanied by software algorithms that can control more than individual LED blocks independently.

The Quest Pro will also come packed with new Meta Quest Touch Pro controllers. They will feature three built-in sensors to track the controller's position completely independent of the headset which means that tracking and range of motion will be improved. These new controllers will also be sold separately at the cost of $299.99 and they can be used with Quest 2.

The headset is available for preorder and it will start shipping in late October on the Meta website

If you would like to read more helpful articles and tips about various software and hardware visit errortools.com daily.

EasyDocMerge Toolbar is a Browser Hijacker for Google Chrome. Usually, such browser extensions are installed without your knowledge. These types of Browser Hijackers are often the cause of many problems while surfing the Internet. The most common problems are unwanted pop-ups, underlined words, additional ads, sponsored links, to generate web traffic and earn revenue of the advertising networks by gathering the users browsing data and sending it back to the Mindspark ads network.

When installed this extension will hijack your home page setting it to MyWay.com, it will also change your new tab page to EasyDocMerge (Powered by MyWay.com Search).

About Browser Hijackers

Browser hijacking is a form of an unwanted program, commonly a web browser add-on or extension, which then causes modifications in the browser’s settings. Browser hijacker malware is developed for a variety of reasons. It redirects you to the sponsored internet sites and inserts adverts on your browser that assist its creator to generate earnings. A lot of people think that the browser hijacker is only a harmless website but that is not the case. Nearly every browser hijacker poses an existent threat to your online safety and it’s important to classify them under privacy dangers. They don’t just mess up your browsers, but browser hijackers can even modify the computer registry, leaving your computer susceptible to various other types of attacks.

Key symptoms that your web browser has been hijacked

There are various signs of web browser hijacking: the home page of the web browser is changed unexpectedly; new bookmarks pointing to porn websites are added to your favorite pages; the essential web browser settings are modified and unwanted or insecure resources are added to the trusted sites list; you’ll see many toolbars on your web browser; you see a lot of pop-up ads on your computer screen; your web browser has become unstable or starts running sluggishly; Inability to navigate to particular sites, particularly anti-malware and other computer security software sites.

How they infect computers

Browser hijackers infect computer systems by numerous means, including via a file-share, a drive-by download, or an infected e-mail attachment. They can also originate from any BHO, extension, add-on, toolbar, or plug-in with malicious intent. A browser hijacker may also come bundled up with some free software that you unintentionally download to your computer, compromising your internet security. Typical examples of browser hijackers include CoolWebSearch, Conduit, Coupon Server, OneWebSearch, RocketTab, Searchult.com, Snap.do, and Delta Search. Browser hijackers may record user keystrokes to gather potentially important information that leads to privacy issues, cause instability on computers, drastically disrupt user’s browsing experience, and finally slow down the system to a point where it will become unusable.

Removal

Certain browser hijacking could be simply reversed by discovering and eliminating the corresponding malware software from your control panel. In some cases, it can be a difficult job to identify and eliminate the malicious component because the associated file might be running as part of the operating system process. You should consider carrying out manual fixes only if you are a tech-savvy person, as potential risks are associated with tinkering with the system registry and HOSTS file. Installing and running antivirus programs on the affected computer could automatically erase browser hijackers and other malicious applications. Safebytes Anti-Malware contains a state-of-the-art anti-malware engine to help you prevent browser hijacking in the first place, and clean up any pre-existing issues

What you can do if Virus Prevents You From Downloading Or Installing Anything?

Practically all malware is bad, but certain kinds of malware do a lot more damage to your computer than others. Some malware sits in between your computer and the internet connection and blocks a few or all internet sites that you would like to visit. It will also prevent you from adding anything to your PC, especially antivirus software. If you’re reading this now, you might have probably recognized that a malware infection is the real cause of your blocked web connectivity. So how to proceed if you need to install an antivirus application such as Safebytes? Although this kind of problem can be difficult to get around, there are a few steps you can take.

Eliminate viruses in Safe Mode

If any virus is set to run automatically when Microsoft Windows starts, stepping into Safe Mode could block this attempt. Only minimal required programs and services are loaded when you boot your laptop or computer in Safe Mode. You will need to do the following to eliminate malware in Safe mode. 1) At power on/start-up, hit the F8 key in 1-second intervals. This should bring up the Advanced Boot Options menu. 2) Select Safe Mode with Networking using arrow keys and press ENTER. 3) When this mode loads, you should have the internet. Now, utilize your browser normally and navigate to https://safebytes.com/products/anti-malware/ to download and install Safebytes Anti-Malware. 4) Once the software is installed, allow the diagnostic scan to run to eliminate viruses and other threats automatically.

Obtain the security program using an alternate web browser

Some malware might target vulnerabilities of a specific web browser that obstruct the downloading process. The best way to avoid this problem is to pick a web browser that is renowned for its security features. Firefox has built-in Phishing and Malware Protection to help keep you secure online.

Run anti-malware from your USB drive

To effectively get rid of the malware, you need to approach the problem of running antivirus software on the infected computer from a different angle. Abide by these steps to run the anti-virus on the affected computer. 1) On a virus-free PC, download and install Safebytes Anti-Malware. 2) Plug the Flash drive into the clean computer. 3) Double-click the Setup icon of the antivirus program to run the Installation Wizard. 4) Choose the flash drive as the destination for saving the file. Follow the on-screen instructions to finish the installation process. 5) Remove the pen drive. You can now utilize this portable anti-virus on the infected computer system. 6) Double-click the antivirus program EXE file on the USB flash drive. 7) Simply click “Scan Now” to run a complete scan on the affected computer for viruses.

Protect Your Computer Against Viruses and Malware With SafeBytes Security Suite

Today an anti-malware program can protect your laptop or computer from different types of internet threats. But how to select the best one amongst countless malware protection software that is available out there? As you might be aware, there are several anti-malware companies and tools for you to consider. A few are really worth your money, but many aren’t. You need to choose one that is dependable, practical, and has a strong reputation for its malware source protection. Among few good applications, SafeBytes Anti-Malware is the strongly recommended software program for the security-conscious user. SafeBytes anti-malware is a powerful, highly effective protection application made to help end-users of all levels of computer literacy in detecting and removing harmful threats from their computer. After you have installed this software, SafeByte's sophisticated protection system will ensure that no viruses or malicious software can seep through your personal computer.

SafeBytes has fantastic features when compared to various other anti-malware programs. Listed below are some of the great features included in the software.

Real-time Active Protection: SafeBytes gives you round-the-clock protection for your personal computer limiting malware intrusions instantly. It will examine your PC for suspicious activity at all times and safeguards your PC from illegal access. Antimalware Protection: Safebytes is made on the best virus engine in the industry. These engines can identify and get rid of threats even during the initial phases of a malware outbreak. “Fast Scan” Features: SafeBytes’s high-speed malware scanning engine minimizes scanning times and extends the life of the battery. Simultaneously, it will effectively find and get rid of infected files or any internet threat. Web Protection: SafeBytes checks and gives a unique safety rating to every website you visit and block access to webpages known to be phishing sites, thus protecting you against identity theft, or known to contain malicious software. Low CPU Usage: SafeBytes is a lightweight application. It consumes an extremely small amount of processing power as it runs in the background so you are free to use your Windows-based computer the way you want. 24/7 Premium Support: Professional technicians are at your disposal 24/7! They will immediately fix any technical issues you may be encountering with your security software. Simply put, SafeBytes has formulated a meaningful anti-malware solution that is aimed to protect your computer against various malware. Malware trouble will become a thing of the past once you put this software to use. For top protection and the best value for money, you can’t get better than SafeBytes Anti-Malware.

Technical Details and Manual Removal (Advanced Users)

If you want to manually remove EasyDocMerge without using an automated tool, it may be possible to do so by removing the application from the Microsoft Windows Add/Remove Programs menu, or in cases of browser plug-ins, going to the browsers AddOn/Extension manager and removing it. You’ll likely also want to totally reset your browser to its default configuration settings. To be certain of complete removal, find the following registry entries on your computer and remove them or reset the values appropriately. However, this is a tricky task and only computer experts can perform it safely. Moreover, some malicious programs are capable to defend against its removal. It is highly recommended that you do the removal process in Windows Safe Mode.

For PC users that are blind or have low vision, the Narrator accessibility feature in Windows 10, lets you use your PC without a display or mouse to complete common tasks – it reads and interacts with things on the screen, like text and buttons. The narrator can be used to read and write an email, browse the internet, and work with documents. In Windows 10, there are a lot of options for Narrator that you can customize. You can change its keyboard shortcuts, personalize Narrator’s voice, enable Caps Lock warnings, and more. You can choose the voice for the Narrator, adjust the speaking rate, pitch, and volume. To change the default audio output device used to play the voice of the Narrator in Windows 10:

• Press the ⊞ WINDOWS + I
• From the Settings menu, click Ease of Access.
• Click Narrator on the left pane.
• In the Narrator window, on the right pane, toggle the button to On to enable Narrator if required.
• Scroll down to the Personalize Narrator’s voice section.
• For the Select where you hear Narrator’s voice option, click the drop-down and select the audio output device you want from the list. Please know that you will not be able to choose if you do not have multiple audio output devices connected to your Windows 10 computer.
• Exit Settings when done.

If you would like to read more helpful articles and tips about various software and hardware visit errortools.com daily.

Kernel_Data_Inpage_Error - What is it?

Kernel_Data_Inpage_Error is a BSOD (blue screen of death) error. Also, know as a 0x0000007A Stop error. This bug check indicates that the requested page of kernel data from the paging file failed to be read into memory. In simple words, this means that Windows has trouble reading from the memory. This can apply to both kinds of memory: stored memory on your hard drive and also the dynamic memory in your RAM. The Kernel_Data_Inpage_Error turns your computer screen all blue, stops the program being executed, and sometimes even leads to abrupt system shut down.

Error Causes

Kernel_Data_Inpage_Error may occur due to numerous reasons. The exact cause of this error can easily be found by going through the code displayed in the parameter of 0x00000007A. Let’s take a look at Kernel_Data_Inpage_Error parameter codes and the underlying causes of its occurrence:

• 0xC0000009A- This parameter code triggers missing nonpaged pool resources
• 0xC0000009C- This represents the installed hard disk drive has bad sectors.
• 0xC0000000E- This indicates a hardware failure or an incorrect drive configuration

Further Information and Manual Repair

No matter what the cause for Kernel_Data_Inpage_Error may be, it is advisable to fix it immediately as blue screen of death error codes are considered to be critical PC errors that can cause serious damages and even result in valuable data loss. Here are a couple of ways to repair this issue on your system:

1. Call the ‘Chkdsk’ (check disk) command on your system.

Windows XP, Vista, and 7 users can call this command, by pressing Windows Key +F and type in ‘chkdsk’ and run. However, you can’t run it while actively using Windows but you can always schedule it to start automatically the next time your computer turns on. Wrap up what you need and then reboot. Chkdsk disk checking process can take a long time, especially on large and slow hard drives. To run this command on Windows 8, open Windows search by pressing Windows Key+ F and then type ‘cmd’. Then right-click on the command prompt and choose the option ‘Run as Administrator’. To continue with the disk checking process, here you will be prompted to provide your administrator authentication. Once you insert the administrator authentication, type the command ‘Chkdsk C:/f/r/x” where the letter ‘C’ indicates the drive you want to examine and repair. Run it to scan for Kernel_Data_Inpage_Errors on your system. Chkdsk command will detect and repair errors on the hard drive and then automatically reboot.

Limitations to this Solution:

‘Chkdsk’ is a value-adding inbuilt disk checking tool in PC new Window versions; nonetheless, this command has certain limitations. It is time-consuming. You may have to wait for a long time for it to scan your system. Also when disk check is running, you will have to stop all other activities on your system. Furthermore, Chkdsk does not scan and fix all registry errors and other PC-related errors. So, you can’t be 100% sure that it will resolve all the Kernel_Data_Inpage_Errors on your PC.

Booting the Windows computer system includes loading it from the various boot devices such as drivers, network as well as USB drives when the computer is turned on. The instant the startup sequence is done loading the operating system the system hardware will be ready to perform some complex operations – in this process, the Boot Log in Windows 10 is a record that maintains the list of success or failure of many pieces of Windows 10 system during the booting process. In other words, the Boot Log is the one that keeps a record of all that has happened while loading from the computer storage system to the memory during the boot process. It is available for several devices like network, hardware devices, and the operating system which assist in detecting issues during the boot process and other issues with regards to troubleshooting. Through Boot Log, you’ll know which drivers were unloaded and loaded from the start of the system during the boot process. You have the option to either disable or enable this feature on your Windows 10 PC. Named as “ntbtlog.txt”, the log file lists all the successfully loaded processes and the unsuccessful ones during the boot process. It is saved to the drive C:Windowsntbtlog.txt. As mentioned, you can enable or disable this feature in two ways – the first one is by using the System Configuration or MSConfig while the second one is using the Command Prompt. In this post, we’ll show you how you can enable or disable Boot Log in Windows 10 either way.

Option 1 – Enable or Disable Boot Log using System Configuration

Enable Boot Log:

• Tap the Win + R keys to open the Run dialog box.
• Then type in “msconfig” and click OK to open System Configuration.
• After that, go to the boot tab and check the checkbox labeled “Boot Log” under the Boot options so that you can enable the Boot Log feature.
• Then click on OK to save the changes made.
• Next, click on the Restart button in the prompt window to get started with the Boot Log process.
• After restarting your PC, go to C:Windowsntbtlog.txt to open the boot log.

Note: As pointed out earlier, the log file contains a list of all the successfully loaded drivers and also the list of drivers that failed to load during the boot process and every time you restart the system, the boot log file will keep on updating and will eventually increase the list of entries. For you to locate the drivers and make your troubleshooting a lot easier, I advised disabling the boot log after troubleshooting. To disable the boot log using System Configuration, refer to the steps below. Disable Boot Log:

• Tap the Win + R keys to open the Run dialog box.
• Then type in “msconfig” and click OK to open System Configuration.
• After that, go to the boot tab and unmark or uncheck the checkbox labeled “Boot Log” under the Boot options so that you can disable the Boot Log feature.
• Then click on OK to save the changes made.

Option 2 – Enable or Disable Boot Log using Command Prompt

Enable Boot Log:

• Go to the Start Menu and then type in “command prompt” in the search bar.
• After that, right-click on the Command Prompt option and select the “Run as administrator” option.
• After opening Command Prompt, type in “bcdedit” and tap Enter.

Note: You have to find the Identifier of the current operating system first to enable the Boot log. You can find it under the Windows Boot Loader section in the “Description” field and in this case, it’s Windows 10. You can also find the operating system identifier under the Windows Boot Loader section next to the field name identifier.

• To check if the boot log entry is disabled or enabled, go check the “Bootlog” field under the Windows Boot Loader. And if it turns out that the “bootlog” entry is enabled, the entry will be “Yes”. Otherwise, the entry will be “No”.
• Next, type in the following command with the operating system identifier to enable the boot log.

bcdedit /set {identifier} bootlog Yes

Note: In the command given above, make sure that you replace the given system identifier with your computer’s system identifier. For instance: In this example, the identifier was replaced with the actual operating system identifier as current.

bcdedit /set {current} bootlog Yes

• Afterward, restart the system to start the Boot log process.
• After the restart, go to C:Windowsntbtlog.txt to open the boot log.

Note: Every time you restart your computer, the boot log file will keep on updating which will increase the size of the log eventually. So if you want seamless and easier troubleshooting, it is advised to disable the Boot log after you troubleshoot. To disable it using the Command Prompt, here’s what you have to do. Disable Boot Log:

• Go to the Start Menu and then type in “command prompt” in the search bar.
• After that, right-click on the Command Prompt option and select the “Run as administrator” option.
• Once the Command Prompt is opened, type in the following command and then tap Enter to disable the boot log feature.

bcdedit/ set {identifier} bootlog No

Note: In the command given above, you need to replace the given system identifier with your computer’s system identifier. For instance: In this example, the {identifier} was replaced with the actual operating system identifier as {current}.

bcdedit /set {current} bootlog No

• Now close the Command Prompt.

Windows 11 comes with glass and transparency effects by default once it is installed. The transparency effect looks really good but if in any case, you do not like them, you can easily turn them off very easily

1. Open settings inside Windows 11
2. Inside settings click on Accessibility in the sidebar
3. Click on Visual Effects on far-right
4. Inside Visual effects, settings click on the switch beside Transparency effects to OFF

Windows will automatically save settings and apply changes right away. Just close your settings application and continue with work. You can always turn it back ON if you change your mind.

There are not many applications for creating mind maps, even fewer that are completely free, so it is with great pleasure to present you with Freeplane. Freeplane is mind mapping, Knowledge Management, and Project Management software completely free and open source. You can it here: https://sourceforge.net/projects/freeplane/files/latest/download

And from developers git page and I quote:

Freeplane is a free and open-source software application that supports thinking, sharing information, and getting things done at work, in school, and at home. The core of the software is tools for mind mapping (also known as concept mapping or information mapping) and using mapped information. Freeplane is written in Java using OSGi and Java Swing. It runs on any operating system that has a current version of Java installed. It can be run locally or portably from removable storage like a USB drive. We use Github only as of the main code repository, all other project parts are hosted at the source forge. So all bugs and feature requests are managed in a separate issue tracker. There is a drop-down box for selecting different types of issues. Other sources of inspiration are our new forum and old forum. Some users write their ideas there. Every contributor and every team member freely decides what task he is going to work on, but for making the best decision we can communicate our self-set goals in the above forum. It is supposed to enable early discussions and community feedback and also to motivate you and other people.

How to start hacking and contributing

People new to the project can start with implementing a new small feature or doing some refactoring or documentation and not with the bug fixing. Not all bug reports seem to be equally important, and if there are important bugs they usually get fixed by people who broke the functionality. I think you should first get there :). For internal developer discussions, there is a private mailing list. It is held private to avoid spam mails. If you want to be subscribed let us know what mail address you are going to use with it. This list is the preferred way to ask all code-related questions because they usually get answered soon and by the most competent team member. Some documentation for new developers is available in Freeplane wiki https://www.freeplane.org/wiki/index.php/How_to_build_Freeplane and also here and here. It is written for new guys and should also be maintained by the new guys to stay up to date. Looking forward to any questions and contributions, Freeplane development team