Playing as Rome in VH/H, on about turn 200 I've encountered a beneficial bug where all my cities have suddenly experienced huge boosts in happiness and growth- it looks like food imports are now operating at "full" in all cities, our of nowhere.
At the moment I'm roleplaying this somewhat, as I've just formed an alliance with the Ptolemaoi and am giving them regular gifts of gold, so I feel I'm simulating grain trade with Egypt. But at some point, it's going to make the campaign boringly easy. Any thoughts?