100% Kept getting crashes and thought it was a fault with climbable surfaces as it always crashed there (duergar outpost) , but have tested that once I had equipped two hand-crossbows to the thief, it all broke. Gone back in Saves to when I just had the one hand-crossbow equipped and no issue. A simple test: can you unequip without a crash. Have a lot to go back through now that I have reverted to an old save, but the restarts were starting to get a little irritating.