KB5070311 throws flashbang grenades

On December 1, 2025, Microsoft released the November security update for Windows 11 versions 24H2 and 25H2 with KB5070311. While it's certainly strange to see a November update arrive on December 1, that's not the strangest thing about KB5070311. The update brings a bug to File Explorer that throws you a flash grenade every time you open a new tab or window.

In the release notes, Microsoft warns users that those who install KB5070311 will experience white screen flashes when using File Explorer in dark mode, stating the following:

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“After installing KB5070311, you may experience issues opening File Explorer in dark mode. The window may briefly display a blank white screen before loading files and folders.”

After installing KB5070311, you might experience issues when opening File Explorer in dark mode. The window might briefly display a blank white screen before loading files and folders.

White flashes on the screen appear when you navigate to or from the Home or Gallery, create a new tab, toggle the Details pane on or off, or select “More details” while copying files.

This annoying bug is nothing new to Windows 11. Their dark mode is known for flashing the screen when you work with File Explorer or open apps like Settings. While there are workarounds with third-party tweaks, so far, we don't have an official fix from Microsoft. The company simply says that a fix is ​​in the works.

In addition to the flash-bang grenades in File Explorer, Microsoft confirmed that the latest update has a bug on the lock screen where the password button is not visible in the sign-in options.

Again, the company simply states that it is preparing a fix.

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Although the press releases will range from very select to rare, I said I'd pass...because sometimes the editors hide.