Windows 11 known issues right now
Problems Microsoft has confirmed in recent Windows 11 updates, newest activity first. If an update broke something on your PC, check here before trying fixes: it may be a known bug with a workaround, or already fixed in a later update.
Source: Microsoft's Windows release health pages for 26H1, 25H2, 24H2, checked every few hours. See also the Windows 11 update history.
Still open (2)
Confirmed, being investigated, or mitigated with a workaround, but not yet fully fixed.
- MitigatedWindows 11 26H1, 25H2, 24H2· updated Oct 13, 2026
Remote Desktop connections might fail for non-admin users with error 0xC000000D
This issue affects non-admin users connecting through Remote Desktop with Administrator protection enabled.
Started with KB5124006 (Sep 22, 2026) · Microsoft's details
- MitigatedWindows 11 26H1, 25H2, 24H2· updated Sep 29, 2026
USB audio devices might fail to start or produce no sound
Some USB Audio Class 1.0 devices display Code 10 or fail in multichannel audio modes after installing the Sept. 8 update
Started with KB5124012 (Sep 8, 2026) · Microsoft's details
Recently resolved
Install the update named in "fixed in" to get the fix.
- ResolvedWindows 11 26H1, 25H2, 24H2· updated Oct 13, 2026
Devices might experience a black screen or desktop loading issues after sign-in
Microsoft has received reports of this issue occurring in some virtual desktop environments.
Started with KB5120996 (Aug 27, 2026) · fixed in KB5127646 · Microsoft's details
- ResolvedWindows 11 25H2, 24H2· updated Oct 13, 2026
Applications which require AC-3 audio decoding might close unexpectedly
This issue is more likely to occur in legacy applications, and unlikely for many modern applications.
Started with KB5124010 (Sep 22, 2026) · fixed in KB5127648 · Microsoft's details
- ResolvedWindows 11 26H1, 25H2, 24H2· updated Oct 8, 2026
Domain-joined devices might lose their secure trust relationship with the domain
Some Credential Guard protected machine accounts might be unable to sign in interactively will valid domain credentials.
Started with KB5124012 (Sep 8, 2026) · fixed in KB5124006 · Microsoft's details
- ResolvedWindows 11 26H1, 25H2, 24H2· updated Sep 30, 2026
Incorrect notifications that "Microsoft Defender Antivirus is turned off"
Microsoft Defender Antivirus remains active and functioning correctly despite notifications following the latest update.
- ResolvedWindows 11 26H1, 25H2, 24H2· updated Sep 17, 2026
Remote Desktop Services might stop responding after Sept. 2026 security update
Some Windows devices with Remote Desktop enabled might experience Remote Desktop Services (RDS) instability.
Started with KB5124012 (Sep 8, 2026) · fixed in KB5129194 · Microsoft's details
- ResolvedWindows 11 26H1, 25H2, 24H2· updated Sep 14, 2026
Host folder shares might be unavailable in Hyper-V-based Linux VMs
Plan9 host folder shares might not appear in the guest environment after installing the September 2026 security update.
Started with KB5124012 (Sep 8, 2026) · fixed in KB5129194 · Microsoft's details
- ResolvedWindows 11 26H1, 25H2, 24H2· updated Sep 8, 2026
Microsoft Teams and Outlook might fail to launch on ARM-based devices
This most likely occurs on new PCs after installing the August Windows security update and does not affect other apps.
Started with KB5121000 (Aug 11, 2026) · fixed in KB5124012 · Microsoft's details
- ResolvedWindows 11 25H2, 24H2· updated Sep 8, 2026
Mouse customization is reset on non-English Windows devices
Custom cursors and cursor animations may intermittently revert
Started with KB5120998 (Aug 27, 2026) · fixed in KB5124008 · Microsoft's details
- ResolvedWindows 11 25H2, 24H2· updated Sep 8, 2026
Desktop background settings are lost or reset on some devices
For affected Windows installations, backgrounds might revert to a black solid color
Started with KB5120998 (Aug 27, 2026) · fixed in KB5124008 · Microsoft's details