This might be related to a current bug .. For the moment you could roll back to the June version via steam.
Or if you are familiar with Lua you can browse to ...
scriptbank / ai / module_combatmelee.lua and comment out line 64
This will fix the issue for the moment.
Line 64 should be :
module_core.debug(e,AIObjNo,PlayerDist,combattype)
Put "--" at the beginning of it to comment it out. i.e.:
-- module_core.debug(e,AIObjNo,PlayerDist,combattype)
See if that helps .
The only person ever to get all his work done by "Friday" was Robinson Crusoe..