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Oct 31, 2013 7:32 PM in response to Mackey13by Linc Davis,First follow the instructions in this support article.
If an iPhoto or Aperture library is the source of your desktop pictures, it may need to be rebuilt, or you may need to update the application to the latest version.
Otherwise, continue as below.
Back up all data.
In the Finder, hold down the option key and select
Go ▹ Library
from the menu bar. From the Library folder, delete the following item, if it exists:
- Caches/com.apple.systempreferences
and move the following items to the Desktop, if they exist:
- Application Support/Dock/desktoppicture.db
- Preferences/com.apple.desktop.plist