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Windows 11 KB5070311 Update Addresses File Explorer and Search Issues

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Microsoft released the KB5070311 optional preview cumulative update for Windows 11, addressing File Explorer freezes, search issues, and other bugs. The update includes 49 changes and is part of the monthly preview updates that precede Patch Tuesday releases. It fixes issues with explorer.exe process responsiveness, SMB share search problems, and LSASS instability. However, the update also introduces a new bug causing bright white flashes when launching File Explorer in dark mode. Microsoft is working on a fix but has not provided a timeline. The update is available for manual installation and updates Windows 11 25H2 and 24H2 devices to builds 26200.7309 and 26100.7309, respectively. Additionally, Microsoft announced there will be no preview update in December 2025 due to minimal operations during the Western holidays, with normal updates resuming in January 2026.

Timeline

  1. 02.12.2025 15:39 1 articles · 23h ago

    KB5070311 introduces File Explorer dark mode flash bug

    The KB5070311 update triggers bright white flashes when launching File Explorer in dark mode on Windows 11 systems. This issue occurs during various actions such as navigating to or from Home or Gallery, creating a new tab, toggling the Details pane, and selecting 'More details' while copying files. Microsoft is working on a solution but has not provided a timeline for the fix. Affected users are advised to switch off dark mode to avoid the issue.

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  2. 02.12.2025 13:19 2 articles · 1d ago

    Windows 11 KB5070311 Update Released with 49 Fixes

    Microsoft released the KB5070311 optional preview cumulative update for Windows 11, addressing File Explorer freezes, search issues, and other bugs. The update includes 49 changes and is available for manual installation. It updates Windows 11 25H2 and 24H2 devices to builds 26200.7309 and 26100.7309, respectively. Microsoft also announced there will be no preview update in December 2025, with normal updates resuming in January 2026. Additionally, the update introduces a bug causing bright white flashes when launching File Explorer in dark mode, which Microsoft is working to fix.

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Information Snippets

Similar Happenings

Windows 11 24H2 Bug Causes Critical System Component Crashes

Microsoft has confirmed a critical bug in Windows 11 24H2 that causes File Explorer, Start Menu, and other key system components to crash after installing cumulative updates released since July 2025. The issue arises from XAML dependency packages failing to register properly, affecting both regular and non-persistent OS installations. Users experience crashes in essential shell components, leading to partially functional systems. Microsoft is working on a resolution and has provided temporary workarounds.

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Microsoft Releases November 2025 Patch Tuesday Updates for Windows 11

Microsoft has released Windows 11 cumulative updates KB5068861 and KB5068865 for versions 25H2/24H2 and 23H2. These updates address security vulnerabilities and various issues, including fixes for browsers, gaming, PowerShell, and Windows Hello. New features introduced include a new Start menu UI, battery icons on the lock screen, Microsoft 365 Copilot page, and enhanced passkey management. The updates also mark the last update for Windows 11 23H2, with support ending in November 2025. Additionally, Microsoft has released the KB5072753 out-of-band cumulative update to fix a known issue causing the November 2025 KB5068966 hotpatch update to reinstall on Windows 11 systems repeatedly. This update is recommended for Windows 11, version 25H2 devices instead of the November 2025 hotpatch update (KB5068966). Microsoft has also announced that it will not release optional updates in December, but Patch Tuesday updates will continue as scheduled. Nvidia has confirmed that the October 2025 Windows 11 updates (KB5066835) cause gaming performance issues on Windows 11 24H2 and 25H2 systems. Nvidia released the GeForce Hotfix Display Driver version 581.94 to address these issues. The October updates also caused other issues such as broken localhost HTTP connections, smart card authentication problems, and broken Windows Recovery Environment (WinRE) on systems with USB mice and keyboards.

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