Earlier this month, we highlighted a serious bug in Windows 11 update KB5055523 that was messing up Windows Hello logins for users, rendering both face unlocks and PIN codes unusable. As it turns out, that update also had a few other issues lurking under the surface, as seems to be par for the course with Windows 11 24H2 updates.
According to Windows Latest, the KB5055523 update has introduced a few bugs for business-related use cases, including major problems with SAP GUI, which may crash with error codes 0xc0000409 and 0x000b1c30 or may fail to start at all.
Upon further investigation, it appears to be a conflict with CrowdStrike Falcon Sensor security software. In this tech alert, CrowdStrike explains that some apps may crash when Additional User-Mode Data (AUMD) is enabled on Windows 11 systems with KB5055523.
Until a permanent fix is issued by Microsoft and/or CrowdStrike, affected users are advised to roll back the KB5055523 update and hold off on Windows 11 24H2 updates until the problem is addressed.
Updated on April 22, 2025: We previously linked to the wrong CrowdStrike support document. The link has been updated and now points to the relevant page for this issue.
This article originally appeared on our sister publication PC för Alla and was translated and localized from Swedish.