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Windows 11's August 2026 update KB5121003 has been linked to game crashes, reboots, and lower frame rates.
Microsoft says it is investigating to determine whether the problem is caused by Microsoft after a week of silence.
Embark Studios blamed a compatibility issue involving the third-party driver inpoutx64.sys, while Microsoft has also pointed to drivers or code installed by RGB lighting devices.
Reports name ARC Raiders and The Finals, with symptoms including unresponsive games, EXCEPTION_ACCESS_VIOLATION errors, freezes, and unexpected system restarts.
More context
Workarounds include uninstalling the update or manually deleting the problematic driver file, though the update also addresses over 400 security vulnerabilities.
Microsoft has previously blocked updates for similar compatibility issues with titles such as Asphalt 8 and Assassin's Creed.