About a week ago I upgraded by MacBook Pro to Leopard. The install went fine and everything has been smooth sailing with one small - yet annoying - issue. I set a picture for my desktop background, and all will be well UNTIL I close the MBP to sleep. Upon waking, the desktop background image changes every 5 seconds. When visiting system preferences, the "change picture" box is unchecked. Even if I check it, and uncheck it, it will still change every 5 seconds. The only remedy I've found thus far is to restart. But whenever I close the machine to sleep, the problem occurs again upon waking. Any suggestions? Anyone else experience this?