Lol, I should have copied and pasted my other post. This is a 6 comp game, all civ's had at least 12 cities, and no, this isn't the first game this has happened in. It happens when the game contains too many units for additional units too be built. It can even stop new cities from being built!
Is there a patch or something to increase the max cities/units in a game? I have had this problem with StarCraft as well {the buildings part}. Thanks for the speedy reply, no Offense taken.