I have a map with some vehicles, CW era. They always shooted at everything they saw, just as planned. Then I worked a bit on the GCW era, munged again and played both eras. Now the vehicles in the CW era don't shoot at anything except me, but never at my AI companions.
I use the AITargetPerson, AITargetAnimal etc. line in the weapon's odf, they should blow the hell out of every enemy, but they simply ignore them. I have no clue why...