Could use help from you all: Using 10.5.1, no problem up until now (new 2.8 iMac). Working all day with Adobe Lightroom 1.3.1, again, no prior problems. The computer froze, which I noted when the screensaver when I left to go eat dinner stayed static without fading out to a new picture. After force quitting and restarting, I went to the System Prefs and when I went to the Desktop/Screensaver section, I got a blank window. I confirmed all the other System Prefs icons work fine. It's as if the Desktop/Screensaver settings are erased/gone/whatever. Anyone with any suggestions, I'm ALL ears. Thanks in advance.