[Uh-Nu-Buh]

Unfortunately, I just kept playing. I've run into some other small bugs. I will read up on the bug reporting guidelines and start paying more attention....

The message did say a little more: Player increase in gold is too large, probably cheating. Something like that.

Other weirdnesses that I've seen in this single player game so far (huge map, 3 ai, hundreds of turns so far):

One commander won't move. Same province has about >60 commanders, so maybe it has something to do with that.

A huge battle (hundreds of units on each side, and dozens of commanders as well), and somehow he got one of my commanders and I ended up with one of his.

Every commander of Tien Chi has loads of items, and he has tons and tons of commanders.... Probably not a bug, just wild that I kill an army and collect items and eventually have too many and start having to drop the lesser ones.