Now it happened not on level up (and with sound disabled), but the message was different:

The exception Breakpoint
A breakpoint has been reached.

Yes, now that i think of it, it's possible that it happens on level up.

I'll try disabling sound to check...

Thanks

Sometimes, when i kill a rat (i'm guessing those white things are rats :)), the game crashes with the following terminate/debug error dialog: The Mana World: twm.exe - Application Error The exception Illegal Instruction An attempt was made to execute an illegal instruction. (0xc000001d) occurred in ...