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UCEERR_UNSUPPORTEDTRANSPORTVERSION
UCEERR_UNSUPPORTEDTRANSPORTVERSION is a Windows User Composition Engine (UCE) HRESULT. It indicates that the two sides of the composition channel cannot communicate because their transport versions are incompatible.
What to check for UCEERR_UNSUPPORTEDTRANSPORTVERSION
- Check for mismatched runtime components, partial servicing, or unsupported side-by-side deployment.
- Repair or update the affected.NET and Windows components using a consistent supported build.
- Avoid mixing private copies of framework rendering assemblies with the system-installed runtime.
Microsoft guidance for WPF render-thread failures
Diagnostic discriminator: Compare the UCE transport versions on both ends of the composition channel. This status requires a version mismatch; it should not be collapsed into generic transport unavailability.
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