Fix Sequoia Wallpaper Resetting

Does your Mac revert to the default Sequoia "Forest" wallpaper every time you restart? Here is the permissions fix.

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The Symptom

You set a custom photo or wallpaper, but after a reboot or waking from sleep, it's gone.

The Fix

1. Reset the Wallpaper Database

The file tracking your selection is likely locked. Open Terminal and run:

killall WallpaperAgent
rm -rf ~/Library/Application\ Support/com.apple.wallpaper

1. Fix Desktoppicture Permissions

Sometimes macOS can't write your new choice to the database. Run:

sudo chown -R $(whoami) ~/Library/Application\ Support/Dock
killall Dock

1. Disable "Display has separate Spaces"

Go to System Settings > Desktop & Dock. Under "Mission Control," toggle "Displays have separate Spaces" OFF and then back ON. This forces a refresh of the multi-monitor wallpaper assignment.

Pro Tip

If you use dynamic wallpapers, ensure the .heic file hasn't been moved to an external drive or iCloud "Optimize Storage" folder, which makes it unavailable at boot.