Known Issue
Microsoft fixes Teams, Outlook launch failures on ARM Windows PCs
Microsoft has fixed a bug that prevented Teams and Outlook from launching after installing updates released since the August 2026 Patch Tuesday. The company confirmed last week that this known issue affects users who haven’t installed Microsoft Store updates on ARM-based Windows devices (such as the Surface Pro 11 and Surface Laptop 7) running Windows […]
Microsoft says September updates fix mouse settings reset issues
Microsoft has fixed a known issue that wiped mouse settings on some Windows 11 systems after installing the KB5120998 August 2026 preview update. According to user reports, mouse cursor personalization settings automatically changed or reset after installing this buggy update, and users couldn’t restore them even after uninstalling KB5120998 from affected devices. Microsoft confirmed the issues on Friday, […]
Microsoft fixes bug that wiped Windows desktop settings
Microsoft says the September 2026 Patch Tuesday updates fix a known issue causing desktop settings to be lost or reset on some Windows devices. The company confirmed last week, after a wave of user reports that their wallpaper switched to a black background automatically, that this bug is triggered after installing the KB5120998 August 2026 preview update on Windows 11 24H2 and Windows 11 25H2 […]
August updates trigger 0xc0000409 errors on Windows Server 2016
Microsoft says the August 2026 security update may trigger 0xc0000409 errors on Windows Server 2016 systems where the Compatibility Appraiser diagnostic service is enabled. On affected systems, users will see the CompatTelRunner.exe (Compatibility Appraiser Telemetry Runner) process crashing. Microsoft Compatibility Appraiser, which controls CompatTelRunner and is a Windows Compatibility Telemetry component, is a background system […]
Microsoft: Windows Server 2025 changes causing app crashes
Microsoft warned customers last week that they may experience application crashes on some Windows Server 2025 due to recent memory management changes. This known issue affects apps that use Address Windowing Extensions (AWE), a set of extensions that lets an application use more than 4GB of physical memory within a 32-bit virtual address space. “Applications running on […]
Microsoft says some users can’t open the Teams desktop client
Microsoft is working to resolve a known issue that causes delays or blocks some users from opening the Microsoft Teams desktop client on Windows systems. The company acknowledged this known issue (tracked as TM1466820) at 16:45 EDT on Thursday and advised affected customers to work around it by using the web or mobile platforms. “Specifically, when […]
Microsoft: KB5120998 mouse reset bug affects only non-English PCs
Microsoft says a known issue that reverts mouse settings after installing the KB5120998 August 2026 preview update affects only non-English Windows 11 systems. The bug was confirmed Friday, one day after the KB5120998 release, which includes Start menu, taskbar, and Windows search improvements for devices running Windows 11 versions 25H2 and 24H2. According to user reports, mouse […]
Microsoft says KB5120998 Windows update resets desktop settings
Microsoft has confirmed that desktop settings are lost or reset on some Windows devices after installing the KB5120998 August 2026 preview update. Microsoft’s confirmation follows a wave of user reports saying their wallpaper switched to a black background automatically after installing this Windows update. The known issue impacts systems running Windows 11 24H2 and Windows 11 25H2, and it may affect the wallpaper, the desktop […]
Microsoft Teams, Outlook fail to launch on ARM-based Windows PCs
Microsoft is working to fix a known issue that causes crashes and launch failures for Microsoft Teams and New Outlook users after installing updates released since the August 2026 Patch Tuesday. These issues affect only ARM-based Windows devices like the Surface Laptop 7 and Surface Pro 11 that run Windows 11 24H2 or later, and […]
Microsoft asks users to ignore ‘Antivirus is turned off’ errors
Microsoft asked customers this week to ignore incorrect alerts that Defender Antivirus has been turned off after installing the latest Defender updates. Although this issue has been affecting users in the Release Preview Channel of the Windows Insider program since June, it appears Microsoft didn’t notice it until now. The erroneous alerts appear on affected systems in the Windows […]