According to the latest reports, Microsoft has just fixed the safe mode problem in Windows 11, but the operating system apparently encountered further problems in the latest cumulative update. KB5012643 is an optional update with numerous fixes, but it crashes applications that use certain components of the .NET 3.5 Framework.
If you’ve used Microsoft’s desktop operating systems for a long time, you probably know something about the .NET Framework. .NET Framework may appear in Windows Update or during the installation of some applications. Many applications rely on the .NET Framework to function properly because it contains a collection of code that developers can call when they create an application.
In short, you only need the .NET Framework to make certain applications work. Unfortunately, cumulative updates apparently broke the .NET Framework integration in the OS, and some applications are now crashing. This happens on those devices that have KB5012643 installed for Windows 11 version 21H2.
Previously, some users experienced Safe Mode and installation issues as well as Blue Screen of Death when installing this particular optional update. As highlighted in the Feedback Hub post, there have been reports documenting various issues in the latest Windows 11 update, including a bug where some .NET 3.5 Framework apps crashed.
“We are running the SQL application on Windows 11 (client and server are on the same system). Works smoothly on Windows 7 and Windows 10. After installing Windows 11 update KB5012643, the application no longer starts. After uninstalling the update, the application The program does work again without issues,” one of the affected users noted in the Feedback Hub.
Thankfully, this glitch does not affect all .NET 3.5 Framework-based applications. In an update to a support document originally published on April 25, Microsoft noted that applications using certain components such as Windows Communication Foundation (WCF) and Windows Workflow (WWF) are affected.
Microsoft wants users to uninstall updates
So if you’re experiencing app crashes on Windows 11, as described by users in the Feedback Hub, and subsequently confirmed by Microsoft, uninstalling the patch may fix the problem.
In the updated documentation, Microsoft’s workaround suggests removing the update manually. To uninstall the update, follow these steps:
- Click the Start button and search for Windows Update settings.
- Windows Update Settings window, select View update history.
- Select Uninstall updates.
- Find KB5012643 in the list.
- Select the patch and click Uninstall.
- In addition to the above issues, users have reported other issues, including issues with the Start menu, taskbar, USB, and more.