I'm new here and i don't get to a forum very often, and i don't know if there's already a topic about that bug but i didn't found it so... Apologies !
So, i installed the mod today, customized my video settings then went to the dungeon. All seems to work great but when i go for a melee hit, the game crashes. I tried to change my video settings, reinstalled everything, but this bug keeps pissing me off :/
is it only when you try to melee things? Perhaps the data containing those animations was corrupted. Have you tried re-copying the diabdat.mpq into the installation folder?
I've had similar problem running game on Mac via winery. Figured out it was something wrong with OpenAL library. But I have no Windows, so I can't really help you