Is it possible that they have lost their trade ports, or their connection between their trade ports and their capitals? In my GB campaign I was trading with the Ottoman Empire according to the diplomatic screen, but that trade was not showing up in trade screen. This was because Austria had captured the Istanbul region which contained their trade port. Since their capital now was just above Transylvania their remaining port in Mesopotamia was no longer connected with their capital and they could no longer trade by sea. I have seen the same with the UP. We were trading partners but when they lost Flanders and the Netherlands to France (they still have Westphalia) trade stopped.
Bug: You still can get a Heroic victory for beating a couple of peasants with a full stack. I just defeated the army of some Spanish captain, he had two units of colonial cavalry and three units of natives and I was rewarded a heroic victory. All my units have been given a Victoria Cross for bravery. heh heh!
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