I think I found a profile handling bug in Mac OS X 10.3.X. It is NOT a security flaw, since (unless you've explicity turned Windows Sharing on) it can't be remotely exploited. Anyway, what happens is this: 1. You delete all the .plist files in ~/Library/Preferences. 2. You log out of Mac OS X. 3. You try to log back in, but the login screen does not respond, so you reboot your Mac. 4. Once it finishes rebooting, you try to get your preferences back to the way you like them, but your changes don't "stick". 5. You post a thread about this issue on MacRumors Forums, and get a reply saying to restore a backup of your profile or reinstall Mac OS X without saving the users. Anyone else experienced this issue, and have any alternative suggestions for fixing it? I am not experiencing this problem right now, but I have in the past, and what I posted is what I ended up doing.