can't logout

Yeah, you heard it. I can't log out from a gnome session (FC5). exits.

There were some power outages yesterday and my pc rebooted a couple of times. That must have left some stale files or something. All seems ok, till I try to exit gnome. (I boot in runlevel 3, then startx).

I can exit X with Ctrl-Alt-Backspace. That, however prevents gnome from starting again, because of some files-sockets it leaves behind intmp (those I'm aware of, it happened before, I deleted them and was able to start gnome again).

While the confirmation dialog hangs, everything else functions properly (though I'd like the hole thing to shut down). I can force the dialog to close by clicking several times on the x, then the session resumes as nothing happened.

I moved all my dot files (except .bash*) in a temporary directory, I deletedtmp-.ICE-unix-*tmp-gconfd-usertmp-orbit-usertmp-mapping-user andtmp-X0-lock and I am able to start gnome again, but, as I said, can't log out. These are all the files I know about.

Oh, yeah, and firefox freezes rock solid on some sites (e.g. www.cnn.com), though this might be java related (or again gnome).

Any suggestions anybody? I'm pulling hairs here.