Problem: Windows automatically goes to dark or light mode, no matter what is set in the system settings. Even worse: when you change the mode in the system settings, windows switches back after a few seconds.
Solution: Check if you have MS PowerToys installed (and very likely updated recently) and disable “Light Switch”. The Release Notes of v0.95.0 (published on Oct. 16th 2025) mention the problem:
NEW: The Light Switch utility in PowerToys allows you to automatically switch between light and dark themes in Windows based on the time of day.
Well it is a nice feature, just that it is enabled by default can be a bit surprising – obviously.
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