Selecting Sleep from the Apple Menu works fine. Waking up the machine from Sleep also works fine. Selecting Shut Down or Restart, however, accomplishes very little. The menu bar disappears, and so do the desktop icons, but the dock and the desktop background just sit there forever (I gave it 30 minutes, that's where I draw the line!) until I click the Finder icon in the dock. This makes the menu bar and the desktop icons reappear like nothing happened. Ideas?