The preview update KB5120998 for Windows 11 versions 24H2 and 25H2, released on August 27, 2026, has caused issues such as erratic mouse pointer behavior and disappearing desktop backgrounds, particularly in non-English versions. Microsoft has acknowledged these problems, indicating that they stem from coding practices that fail to load certain settings correctly. Specific issues include a "black desktop background" due to desktop settings not loading and mouse customization resetting to default configurations. The problems may be related to translation issues within the registry, as registry keys have been altered post-update. Users have suggested that manually adjusting these registry keys could restore normal functionality.