Microsoft has confirmed that some users may experience desktop loading issues, including black screens, after installing the August 2026 preview updates and subsequent updates.
However, the company says this mainly affects Azure Virtual Desktop (AVD) hosts using FSLogix (a software solution that speeds up user profile loading in virtual desktop environments).
Windows users affected by this known issue may experience multiple symptoms. The most common symptoms include a black screen after sign-in, so users can’t access their desktop until they start the desktop session manually, and application event logs showing Windows Explorer crashes.
Until a permanent fix is available for those who installed KB5120996 (Windows 11 26H1), KB5120998 (Windows 11 24H2/25H2), and this month’s Patch Tuesday updates (KB5124008 and KB5122880), Microsoft says users can temporarily work around the issue by manually launching Windows Explorer.
This can be done by opening Task Manager (Ctrl+Shift+Esc), selecting Run new task, entering explorer.exe, and clicking OK.
Microsoft has also mitigated this issue for enterprise customers via Known Issue Rollback (KIR), a Windows feature that reverses buggy updates delivered through Windows Update.
IT administrators can apply the mitigation on enterprise-managed devices by installing one of the following group policies:
“You will need to install and configure the Group Policy for your version of Windows to resolve this issue. You will also need to restart your device(s) to apply the group policy setting,” Microsoft said. “Note that this Group Policy will disable the change causing this issue until a resolution is released in a future Windows update.
Admins can find further guidance on deploying and configuring KIR group policies on Microsoft’s support website.
Earlier this month, Microsoft also resolved known issues that wiped mouse and desktop settings on some Windows 11 systems that were also triggered after installing the KB5120998 August 2026 optional update.
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