What does HRESULT 0x8898008A (MILERR_MALFORMEDGLYPHCACHE) mean?

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: The Media Integration Layer glyph cache contains malformed bitmap data.

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MILERR_GLYPHBITMAPMISSED	MILERR_GENERIC_IGNORE

MILERR_MALFORMEDGLYPHCACHE

MILERR_MALFORMEDGLYPHCACHE is a Windows Media Integration Layer (MIL) HRESULT. It indicates that glyph bitmaps in the cache have unexpected dimensions or an invalid representation.

Diagnostic discriminator: Rebuild the glyph cache and repeat with the same font, glyph, and rendering settings. Success after rebuilding isolates the cached representation; recurrence with a fresh cache points to cache construction, lifetime, or font data.

What to check for MILERR_MALFORMEDGLYPHCACHE

Discard and rebuild the glyph cache rather than continuing to use the malformed entries.
Check font loading, glyph-cache ownership, and device reset handling for stale or corrupted resources.
Capture font identity and rendering settings without logging user text or private document contents.

Microsoft documentation about WPF hardware-accelerated rendering

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