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Microsoft has fixed a bug introduced by the optional KB5120998 preview update that caused mouse cursor personalization settings to revert to defaults on some Windows 11 24H2 and 25H2 devices, particularly non-English installations. The company says the September 8 KB5124008 cumulative update resolves the issue and is urging affected users to install it, noting that uninstalling the buggy update did not restore settings.
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.
Microsoft has clarified that a mouse personalization reset bug tied to the August 2026 preview update KB5120998 only impacts Windows 11 devices set to non-English locales. The company found that certain code components fail to load correctly on these systems, causing cursor and animation settings to revert to defaults instead of user preferences. The update, which also brings Start menu and taskbar changes, is optional and only installs automatically if users have enabled the setting to receive updates as soon as they're available.
Microsoft has acknowledged that its optional KB5120998 preview update, released August 27, 2026, causes desktop backgrounds to reset to solid black on Windows 11 24H2 and 25H2 devices. The company says the bug prevents desktop settings like wallpaper, slideshow options, and contrast themes from loading correctly, and affected users cannot manually restore their previous customizations. The same update was already flagged a day earlier for resetting mouse settings with similar restoration problems.
Microsoft confirmed that its optional KB5120998 preview update, released August 27, is resetting or corrupting users' custom mouse cursor settings on Windows 11. Affected users report cursors becoming oversized, appearing as generic white icons, or vanishing entirely, with custom animations reverting to defaults. Microsoft acknowledged the bug on its known issues page but has not yet issued a fix.
Microsoft has acknowledged that its optional KB5120998 preview update, released August 27, 2026, is causing custom mouse cursor personalizations to revert to default settings on Windows 11. Affected users report high-DPI cursors being swapped for standard white ones and custom animations disappearing, with no way to restore prior settings. The company says it is investigating and is asking impacted users to submit reports through the Feedback Hub.
Microsoft has released the KB5120998 preview cumulative update for Windows 11 24H2 and 25H2, bundling 35 changes centered on taskbar positioning, a compact taskbar mode, and new Start menu size and layout options. The optional update also begins rolling out Administrator Protection, a feature using just-in-time privileges to limit elevation-of-privilege attacks, though it remains off by default and needs Intune or Group Policy to enable.