What does HRESULT 0x88980406 (UCEERR_RENDERTHREADFAILURE) mean?

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: The WPF rendering thread failed while processing composition work.

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UCEERR_HANDLELOOKUPFAILED	UCEERR_CTXSTACKFRSTTARGETNULL

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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