Just been discussing on Xsyon chat with this one.
Some games have a safe mode client setup in this installation directory (and start button drop downs) for when you just have to stretch those options as far as you can possibly go, and then when entering back into the client, bam crashes and kicks you out.
I've heard you can delete your config file or something to reset your settings?
Dunno just a thought might be nice to put a safe mode client in the install too for clueless people like myself
My two cents.
EDIT: Oh and also a scan files button? to scan through files if you think one is corrupt causing the crashes.