[Kobal2]

I've seen it one AAR, but I forget what caused it exactly. The player wasn't cheating however.
IIRC it was something like a unit recruitment which couldn't go through for some reason (unrest jacked up during the magic phase perhaps ?), and so the player had his gold returned to him on top of his regular income which caused the game to spaz out and spout that message. I'll try to find the AAR again for more details.