**Critical Bug Fixed: Microsoft Resolves Issue Causing Lost Desktop Settings**
In a major relief for millions of Windows users, Microsoft has finally addressed a critical bug that was causing desktop settings to be lost or reset on some devices. The issue, which surfaced after the installation of the KB5120998 August 2026 preview update, had been plaguing users with a black background and malfunctioning mouse settings.
The problem affected users running Windows 11 version 24H2 and 25H2 systems, who reported that their desktop wallpaper was automatically switched to a solid black color. Moreover, attempting to restore customized settings proved futile as the issue prevented the correct loading of settings, resulting in default black backgrounds being used instead. The KB5120998 update also reset mouse settings, making it impossible for users to restore their previous settings.
Microsoft confirmed that the bug was triggered after installing the optional KB5120998 preview update, which may have installed automatically on devices with the “Get the latest updates as soon as they’re available” option enabled. Although this update is optional and requires user consent, its installation had a significant impact on users’ desktop experiences.
Fortunately, Microsoft has released a patch to resolve the issue through its September 2026 Patch Tuesday cumulative update (KB5124008). The company advises users to update their devices immediately, as the latest security update contains important improvements and resolutions, including this critical one. This move comes as a sigh of relief for millions of Windows users who had been struggling with the bug.
It’s worth noting that Microsoft has faced similar issues in the past, such as the KB4539602 Windows 7 update in February 2020, which broke desktop wallpaper functionality and caused wallpapers in ‘Stretch’ mode to display blank black screens. However, this latest fix marks a significant step forward for the tech giant in addressing critical bugs and ensuring a seamless user experience.
**What You Can Do**
To ensure that your device is protected from this issue, we recommend updating your Windows system as soon as possible. Microsoft has made it clear that the KB5124008 update contains essential improvements and resolutions, including the fix for the lost desktop settings bug. By keeping your system up-to-date, you can avoid any potential disruptions to your work or personal activities.
Moreover, if you’re running an optional update like KB5120998, we suggest being cautious and only installing it when necessary. Always monitor your device’s performance and be aware of any updates that may affect your user experience.
In conclusion, Microsoft’s prompt response to this critical bug is a testament to the company’s commitment to providing a secure and reliable operating system for its users. With this fix in place, Windows users can breathe a sigh of relief, knowing that their desktop settings are safe from being lost or reset.
Source: Bleeping Computer — 2026-09-10