What does HRESULT 0x88980400 (UCEERR_INVALIDPACKETHEADER) mean?

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: The composition command packet has an invalid header.

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MILERR_DISPLAYID_ACCESS_DENIED	UCEERR_UNKNOWNPACKET

UCEERR_INVALIDPACKETHEADER

UCEERR_INVALIDPACKETHEADER is a Windows User Composition Engine (UCE) HRESULT. It indicates that the composition engine rejected a command packet before it could be parsed because its header is invalid or inconsistent.

What to check

Capture the preceding WPF rendering exception and the call sequence that led to the failure.
Check for corrupted process memory, unsafe interop, or invalid serialized composition data.
Reproduce the issue with a minimal visual tree before changing application rendering logic.

Microsoft guidance for WPF render-thread failures

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