Microsoft Confirms Windows 11 Update Bug Causing Black Screens and Loading Issues
Microsoft says a Windows 11 update can black-screen Azure Virtual Desktop sessions after sign-in.
Microsoft confirmed that Windows 11 updates starting with the August 27, 2026 non-security preview can stop the desktop shell from starting after sign-in. The failure is seen mainly on Azure Virtual Desktop hosts using FSLogix with certain existing profiles, affecting 26H1 (KB5120996, OS Build 28000.2804) and 25H2/24H2 (KB5120998). Microsoft marks it mitigated and offers a manual explorer.exe launch plus Known Issue Rollback policies KB5124006 and KB5124010 while a permanent fix is developed. Windows Server is not listed as affected.
- Black screens follow sign-in when Explorer crashes and the shell fails to start.
- Impact is mainly Azure Virtual Desktop hosts using FSLogix with existing profiles.
- Affected builds: 26H1 via KB5120996; 25H2 and 24H2 via KB5120998.
- Users can launch explorer.exe; enterprises should deploy the matching KIR and reboot.
- Microsoft calls it mitigated; the rollback is temporary until a permanent fix.
From the original article
2 min read at cybersecuritynews.com
Microsoft has confirmed a Windows 11 issue that can leave users staring at a black screen after signing in, with the desktop shell failing to start automatically. The problem emerged after installation of the August 27, 2026 non-security preview updates and later cumulative updates. Microsoft lists the incident as “mitigated,” while engineers continue developing a […]
By Guru Baran · cybersecuritynews.com
A short excerpt; the article and its images belong to the publisher. Summary, key facts and assessment above are AI-written from the article and can be wrong.