OS X: System Preferences stops responding after viewing Desktop & Screen Saver pane

System Preferences may stop responding if you select an iPhoto Event that is no longer available in iPhoto as the source for your desktop picture.

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  1. Quit System Preferences if it's running.

    If System Preferences is running but not responding, choose Force Quit from the Apple menu, or right-click its icon on the Dock and choose "Force Quit".
  2. Open iPhoto.
  3. Select Events in the Source list (on the left side of the iPhoto window).
  4. Double-click on any of the events shown. Verify that the name or date of this event is now shown under RECENT in the Source list.
  5. Choose Apple menu () > System Preferences.
  6. Click Desktop & Screen Saver, click on Desktop, and verify that you can now select a new desktop picture.
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