I've noticed this on a couple games now, but only since the last update. I can save a game. But when I exit and then try to load a saved game, I can't see anything on the main map. (Main map not minimap which is fine.) All other screens appear correctly, but the main map screen is completely black except that wherever my cursor registers the coordinates "0,0". Nothing else. I can make changes as normal on all other screens, advance turns, etc., but no main map. I'll email the bug report and my system specs.
Thanks,
Rex