Sorry I have 2 threads asking questions, but I had another issue. My wallpaper is set to rotate every 5 minutes using a folder inside iPhoto. My wallpaper changed to the default Lion wallpaper and when I went into system prefs I had to hit the little + sign and re add my iPhoto Wallpaper folder. Only change I can think of is that I used CCcleaner and maybe that did something. It is working fine again currently, but I am curious if another had the same issue? I ran disk repair and did and overall check, nothing seemed out of the ordinary.