I don't think there is one.
Added 9 minutes later
If all the graphical bugs are fixed, I would pay attention to the AI behavior. In the campaign, Queen, mission 5, "Sunset of the King," the demons simply flee instead of fighting when attacking the castle. Warlock, mission 3, "Servant of the Cult," the demons do nothing when they appear. Ranger, mission 3, "Defense of the Undead," they also essentially do nothing.