I that noticed sometimes when playing AoDII a town would cry out that there's not enough of a required resource to finish a building. I look in, and there's for example -150 horses in the warehouse. I didn't get it what caused it, and it's not that often that this happens, but today I finally realized what caused it. Not everytime though... When changing profession on the map, and converting an equipped (Soldier, Dragoon, Scout, Pioneer) to colonist, you sometimes don't get the equipment back in the town warehouse. Instead the game removes an equal amount from the warehouse, making it negative in some cases. I am not sure if this is AoDII or Civ4Col problem, but I've never got it to happen in vanilla. The only way I have found to not have this bug happen on me is to always change profession inside town screen, by dragging the unit into town and out again. Very annoying. Please tell me if you have encountered this, or know a fix.