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UCEERR_CHANNELSYNCTIMEDOUT
UCEERR_CHANNELSYNCTIMEDOUT is a Windows User Composition Engine (UCE) HRESULT. It indicates that the UI side waited for the rendering channel to synchronize but the render side did not complete in time.
What to check
- Check for a blocked render thread, GPU stall, driver problem, or long-running rendering operation.
- Capture UI and render-thread stacks during the hang instead of immediately increasing timeout values.
- Test whether the issue disappears with reduced visual complexity or software rendering.
Microsoft guidance for WPF render-thread failures
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