There seems to be an issue with enviroment effects triggering, using 3.10 OXCE+. Attached is a save (Bug5.sav) from a mission that should have cold enviroment, but doesn't. It's not reproducible though. Loading a save before the mission and then going to the mission spawns a mission with the correct cold enviroment.
Next bug (Bug4.sav): Can't meele targets on stairs. You can hit them (hit sound plays), but the hit log says it is a miss.