Attempting to swap places when engaged in combat by a monster gives a LUA error, dims the screen as if blinded and prevents any further moving. You can use talents, but any attempt to move spawns more LUA errors. Only way out was ctrl+alt+del and reloading.
The bug appeared somewhere after level 42, in the middle of prides - top suspect for me is giving the golem Molten Skin talent, since nothing else had changed. Save file in the link below: