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UCEERR_RENDERTHREADFAILURE
UCEERR_RENDERTHREADFAILURE is a Windows User Composition Engine (UCE) HRESULT. It indicates that the background rendering thread encountered a failure while processing graphics or composition commands.
What to check
- Capture the complete inner exception, event log entries, graphics driver version, and Windows build.
- Test with hardware acceleration disabled to determine whether the problem is related to the display driver or GPU path.
- Update or roll back the display driver only after confirming that a minimal WPF scenario reproduces the failure.
Microsoft guidance for WPF render-thread failures
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