Well, the thing is that it only seems to crash on PowerPC Macs not Intel, and according to the traceback, it crashes in the first procedure that uses the decrypt function in the game. That function simply just decrypts a file that contains information about the level to load, so I can't see what else should get it to crash -- and with only the PPC's crashing, it seems to actually be an endian issue.

Anyway, I've sent both the hi(Key) and NtoLE(Key) versions to some of the people that have been getting crashes. I'm waiting to hear back from them.