GoKawiilMicrosoft confirms KB5120998 mouse reset bug hits only non-English Windows 11 PCs
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.