Microsoft September Update Fixes Mouse Settings Reset Problem

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Microsoft addressed a reported problem that caused mouse configuration parameters to revert to default values on specific Windows 11 systems following the deployment of the KB5120998 August 2026 preview update.

Problem Overview

Users encountered persistent issues where personalized cursor settings, including visual effects and pointer configurations, were erased after applying the update. Attempts to restore these parameters through manual adjustments or uninstalling the update proved ineffective.

Cause of the Issue

The issue was first acknowledged by the company on Friday, the day after the update’s release, which aimed to enhance the Start menu, taskbar, and search functionalities for Windows 11 versions 24H2 and 25H2. Microsoft attributed the problem to “code components” within non-English Windows installations, which led to failures in loading user-specific settings.

Resolution and Update Details

Microsoft confirmed that the bug was resolved in the KB5124008 September 2026 cumulative update and urged users to apply the latest security patch. The update, released on September 8, 2026, included critical fixes alongside other improvements. Microsoft emphasized that installing the update would address the mouse settings reset problem.

Related Issues and Ongoing Monitoring

The KB5120998 update was an optional patch requiring user initiation through the Windows Update interface. This incident follows a series of recent fixes for mouse-related anomalies on Windows devices. In October, emergency updates were issued to resolve a flaw that rendered the Windows Recovery Environment (WinRE) inoperable by disabling USB input peripherals. More recently, investigations were underway into a separate bug causing the mouse pointer to vanish for certain classic Outlook users during interface interactions. Additionally, Microsoft resolved a parallel issue where custom desktop configurations were erased after installing the KB5120998 preview update. The company continues to monitor and address technical challenges impacting user experience across its operating systems.