GoKawiilMicrosoft's September Patch Tuesday update fixes black-wallpaper bug on Windows 11
Microsoft has resolved a bug that made desktop wallpapers turn solid black and reset mouse settings on Windows 11 24H2 and 25H2 devices. The issue stemmed from the KB5120998 preview update released in August 2026, and Microsoft says installing the KB5124008 update from September 8 fixes it.
GoKawiil's interpretation of the reporting above, not reported fact.
The bug affected personalization settings that couldn't be manually restored, frustrating users even after reverting changes, which shows how optional preview updates can introduce disruptive side effects. It also echoes a nearly identical wallpaper bug from 2020, suggesting recurring fragility in how Windows handles desktop customization across updates.
- KB5120998 caused black wallpapers and broken mouse settings on Windows 11 24H2/25H2.
- KB5124008, part of September 2026 Patch Tuesday, fixes the issue.
- A similar wallpaper bug occurred on Windows 7 in 2020 via KB4539602.
Logitech MX Master 3S Wireless Mouse — If a Windows update just scrambled your mouse settings, the MX Master 3S is a great excuse to rebuild your setup properly. Its Logi Options+ software stores your button mappings and pointer preferences in its own profile, so your customizations don't live and die by Windows' desktop settings. Comfortable, quiet-click, and built for people who spend all day at a desk.
See Logitech MX Master 3S Wireless Mouse on Amazon → Affiliate link — we may earn a commission on purchases, at no extra cost to you. Product picked by AI based on this article; it is not a tested recommendation.Source: bleepingcomputer.com, 2026-09-10
Published there as: “Microsoft fixes bug that wiped Windows desktop settings”
Read the original report → The summary and analysis above are GoKawiil's own, written from reporting by the source above. Facts and quotes belong to the original publisher.