KB5120998 reported problems: community reports
Public community reports mentioning the same update and symptom are grouped as an early-warning signal.
Signal strength
Community reports 6 · independent sources 2 · confidence 95%
Status: Watch closely
Source samples
- KB5120998 Windows 11 Insider Release Preview build 26100.9267 (24H2) and 26200.9267 (25H2) - Aug. 14 · ElevenForum · source weight 68
- KB5120998 Windows 11 Cumulative Update Preview build 26100.9278 (24H2) and 26200.9278 (25H2) - Aug. 27 · ElevenForum · source weight 68
- Update KB5120998 SystemFileChecker Change! · ElevenForum · source weight 68
- Microsoft is investigating reports of Windows 11 KB5120998 breaking the mouse cursor · Reddit · source weight 55
- August 27, 2026—KB5120998 (OS Builds 26200.9278 and 26100.9278) Preview · Reddit · source weight 55
- Windows 11 KB5120998 out with Movable Taskbar, customizable Start menu (large/small, no recommendation), and Windows Search without Bing/MS Store! · Reddit · source weight 55
Related issue topic
How to read this
These are public community/support-forum signals, not an official vendor confirmation. Updatehey clusters repeated reports to surface possible problems early and keeps official issues separate.