Hello Rick Scheiderich,
I understand your situation. The most common causes for this are:
- Personalization sync — If Windows Backup is syncing your settings across devices, it can override your local background choice. To disable: Settings > Accounts > Windows Backup > Remember my preferences, and toggle off Personalization.
- Slideshow conflict — Check Settings > Personalization > Background and make sure it is set to Picture or Windows Spotlight, not Slideshow.
- Windows Update reset — A recent update can reset personalization settings. After disabling sync, manually re-set your preferred background and it should hold.
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