A critical bug in Microsoft’s recent KB5120998 update has left non-English Windows 11 users without control over their mouse settings. The issue, which was first reported on September 2, causes mouse cursor personalization settings to revert back to default after installing the update, leaving affected users unable to restore their previous settings.
The bug affects only non-English versions of Windows 11, including both versions 25H2 and 24H2. According to Microsoft’s investigation, the issue is caused by code components used in non-English installations that fail to load, resulting in a default setting being applied instead. This means that users who rely on customized mouse settings may find themselves struggling with reduced functionality or even having their settings reset entirely.
The KB5120998 update was released on August 27 as part of Microsoft’s regular preview updates for Windows 11. While the update includes improvements to the Start menu, taskbar, and Windows search, it also brings this critical bug that can cause significant inconvenience to non-English users. It’s worth noting that this issue only affects users who have installed the optional KB5120998 update, which is not automatically downloaded or installed by default.
Microsoft has acknowledged the problem and has provided a workaround for affected users. However, the company has also emphasized that it will continue to investigate the root cause of the issue and provide a permanent fix as soon as possible. In the meantime, non-English Windows 11 users are advised to be cautious when installing updates and to monitor their mouse settings closely.
This bug highlights the importance of careful testing and validation before releasing software updates, especially those that affect system-level settings like mouse customization. It also underscores the need for Microsoft to prioritize more robust quality assurance processes to prevent similar issues from arising in the future.
For Windows 11 users who rely on customized mouse settings, this bug serves as a reminder to exercise caution when installing optional updates and to regularly back up their settings. By doing so, users can minimize the risk of losing their personalized settings due to unforeseen bugs like this one.
Source: Bleeping Computer — 2026-09-03