At random encounters with the Sorcerer, if you kill him (say, you kill him right after he fire off one of those purple rings), when the purple ring is supposed to spawn a bishop, it causes the crash.
It mainly happens if he is gibbed though, haven't checked if it does that with normal death.
"well, im not too sure. I mean, we made money, but im not able to wipe my ass with $100 bills yet." - DBThanatos
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Spetsnaz. When the only way to kill a terrorist is with a back-flipping Apache attack.