OK, something has gone screwy in my system. A few days ago I thought my desktop looked emptier than usual, and indeed, some icons had disappeared. A few hours later, they were back again. World of Warcraft has crashed 3 times in 2 days, but other than that I can't think of the last time it crashed. Adium seems to be quitting on its own accord. I've rebooted, repaired permissions, and verified the drive. I have not made any hardware changes; I've never even had the memory door open (I'm on an Intel iMac and am using Apple memory). I don't recall doing any major changes on the software side, I installed 10.4.7a but that was well before these problems started occurring. It is of course difficult to troubleshoot these things online, but any suggestions? Thanks Edit: Oh, VLC completely locked the system (had to hold the power button) when I tried to go into fullscreen a little while ago. I've never had that happen before, and it worked fine when I tried again.