I just got finished playing a game with large map and 10 players. And a few odd things happened.
1) I had an Army with a few heroes and my sovereign inside an opponents territory. Well I ended the turn and I get this message saying that I had to pay 377 mana to teleport my sovereign to nearest city and that all my heroes that were in the stake took a wound. It did not say what happened and I was not attacked by another army because no popup came up and there were no armies in the area that I could see.
So I reloaded my auto saved and watch the army this time while I hit end turn and the same thing happened. There was no message popping up telling me what caused this. Well I did this 3 more times with the same results. On the 4th time I moved my army and it happened again only this time only one hero (Corin the Archivist) was sent back to the nearest city but the army was still there. I looked at the stack and everyone was hurt bad and Corin was in the stack too. and here is the weird part, I checked my closest city and Corin was there as well and was pretty hurt in fact it took a few turns before the game let me move him. Now I had two Corins.
Since I had them in two stacks I renamed one of the Corins however the name I gave him was also changed on the other. A few turns later I say another "doubling effect" happen to the same army however this time the entre army was double and showed a number two above the stack. then I moved the stack and the duplicate army disappeared.
2) Alsio at the end of that game the NPC won by the Spell of Making however the pop up at the end of the game said I was defeat by conquest.
3) I have also seen many times in games with Krax that when he uses that ability to take your city with out a fight all you see is a little note on the side saying the city was conquered by Krax. And the army you had in the city is standing next to it. I thought this was a bug because the game never told you what happened. It would be nice if the game would tell you these things.