Microsoft has released Windows 11 Insider Preview Build 27950 to the Canary Channel, bringing a series of much-needed fixes. Many Insiders had reported screen flickering issues in browsers and taskbar preview misalignment bugs after changing display resolutions. With Build 27950, Microsoft has addressed these along with several other system-level fixes.
Key Fixes in Build 27950
1. Screen Flickering Issues Fixed
- Insiders previously reported random screen flickers while using browsers or switching between apps.
- This was traced back to a graphics rendering issue in earlier Canary builds.
- Fix: Build 27950 resolves this, ensuring smoother browsing and app usage without visual glitches.
2. Taskbar App Preview Misalignment
- Hovering over taskbar icons sometimes displayed preview windows misaligned from the taskbar after a display resolution change.
- Fix: Previews now align correctly with their respective icons, restoring normal taskbar behavior.
3. File Explorer & Context Menu Improvements
- Fixed sluggish context menu responsiveness.
- Resolved Open/Save dialog hangs in some apps.
- Addressed right-click menu toggling issues.
4. Installation & Update Stability
- Fixed rollback errors during update installations, such as:
- 0xC1900101-0x20017
- 0xC1900101-0x30017
- These fixes improve build upgrade reliability.
5. Audio & Dynamic Lighting Fixes
- Resolved an issue where audio stopped working after updates.
- Fixed a Dynamic Lighting bug where the controller consumed CPU resources after unlocking the PC.
Known Issues in Build 27950
Even with these improvements, one bug remains:
- On Arm64 devices, Insiders may see more frequent bugchecks (IRQL_NOT_LESS_OR_EQUAL error).
- Microsoft is investigating, so Arm64 users should update with caution.
How to Get Build 27950
If you are part of the Windows Insider Canary Channel, follow these steps:
- Open Settings → Windows Update.
- Ensure your PC is enrolled in the Insider Program (Canary Channel).
- Click Check for updates.
- Download and install Windows 11 Insider Preview Build 27950.
- Restart your PC to apply the fixes.
Optional Screenshot Note: Add a screenshot of Windows Update showing Build 27950 available for download.
Should You Update?
- Yes if you’ve been struggling with screen flickering or taskbar preview issues.
- Yes if you experienced update rollback errors in earlier Canary builds.
- Hold off if you’re on an Arm64 device, since stability issues are still under investigation.
Windows 11 Insider Build 27950 is an important update for Canary Channel testers. By fixing long-standing screen flickering, taskbar preview misalignment, and update rollback errors, Microsoft has taken another step towards stabilizing future releases.
If you’re affected by these issues, updating to Build 27950 should provide noticeable improvements.
