I've played the game as a fighter till the end.
Now I want to replay as a magic user and in certain places the game crashes, for instance in the Grimmhold Maintainance Level or when I want to go east from Western Tanglewood, where Grimmhold West is located or to the south of Northern Crakamir.
I'm not sure if that's all, because I didn't try more.
This happens on several Macs, on an Intel Pro as well as on an iMac PPC G5 and on a third one I've tried a Mac Dual PPC G5.
Let me know if there is a trouble shooting around somewhere.
I found out, that for some reason the game does build the .ent and the .opq files in the game-slot and crashes.
Sometimes I can pick those files from another saved game, but then all the items and enemies are gone.