[Uh-Nu-Buh]

I'm playing a single player game, and did the global enchantment (Riches from Beneath?) that doubles your gold and resource production. The next turn I went from about 8K gold to 16K and got a big:

Message from Host: Player Is Cheating

And it seems to cap me at about 16K gold (total, not just annual production). Anybody else run into this?