After reading your post brent_james I also increased income of some provinces (Bavaria-11300 and Bohemia-1230),then lost them to the rebels, but the game didn't crash. I kept on playing, but the game still wouldn't crash. I don't think your problem is related with that the game couldn't calculate the amount of pillaged folrins, as that loot depends on the value of destroyed buildings and not the income of a province. Anybody correct me if I'm wrong.