I have been having problems on a Huge map. My machine has 16Gigs of RAM so it should be able to handle huge maps. Also it is Windows X. Problems I have seen: 1 - game crashes and even though previous save is used, game crashed again at the same spot (end turn), even if different actions are preformed. 2 - After conquering all the capitals I can find, game tells me there are two more capitals of unmet players. Complete map reveal shows that no capital is currently controlled by any AI player. It seems that the capitals were destroyed somehow, possibly after being captured by barbarians. A domination victory becomes impossible. I have seen a report of the same problem, also on a Huge map, on the Steam forums. Maybe these problems don't have anything to do with Huge maps, but I kept running into crashes on Huge maps which caused me to give up the game for a while. The last problem didn't cause a crash but does seem to result from some kind of data corruption.