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UCEERR_MALFORMEDPACKET
UCEERR_MALFORMEDPACKET is a Windows User Composition Engine (UCE) HRESULT. It indicates that the composition engine could not interpret the command payload because its internal format is incomplete or invalid.
What to check
- Check for memory corruption, unsafe code, and native libraries that interact with the rendering process.
- Verify that related WPF assemblies and system components have not been mixed across incompatible versions.
- Use a minimal reproducible case and capture a crash dump if the error repeats.
Microsoft guidance for WPF render-thread failures
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