Originally Posted by grey_1
I don't have that game Shocky, so I can't test myself, but a quick google on "Civ V artifacting" shows this a pretty common issue. It might just be that game. I'm at work atm so don't really have time for an in depth search, but it may just be the game.
I hope that's the case, like I said it's very specific so it could just be the game, so long as I get no artifacts in anything else I'm going to leave it for now and see how it goes.