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A black screen after Windows logon? No desktop or taskbar, and explorer.exe does not start?
These symptoms appeared after the August and September 2026 Windows updates in certain virtual desktop environments using FSLogix.
⚠️ The problem
Users could log on successfully, but the screen then remained black.
Typical symptoms:
* explorer.exe does not start or crashes repeatedly.
* The Windows Shell does not fully initialize.
* The desktop remains black or appears only after a long delay.
✅ The solution: update Windows and FSLogix
Microsoft released a correction with Patch Tuesday on October 13, 2026.
1️⃣ Install the Windows update
KB5127648 for Windows 11 24H2, 25H2 and 26H2.
2️⃣ Update FSLogix
Update to FSLogix 26.08 (3.26.826.17182).
This version includes additional improvements and fixes. Updating FSLogix is a supplementary recommendation; the officially confirmed black-screen fix is delivered through the Windows update.
3️⃣ Validate logon
After the update:
* Restart the VDA.
* Test logon with existing FSLogix profile containers.
* Check Application Events 1000/1001 for explorer.exe crashes.
* Check the FSLogix profile logs.
* If applicable, withdraw deployed Known Issue Rollback (KIR) policies after successful testing.
💡 Finding in the Wild
A black screen in a Citrix environment does not automatically mean the Citrix VDA, HDX or profile containers themselves are the cause.
In this case, the documented cause lies in Windows Shell initialization.
My recommendation: update and test Windows and FSLogix versions together on a pilot VDA before deploying changes to production.
🔗 Microsoft sources:
Windows fix:
FSLogix release notes:
