Hi, tried the game on an iMac, the bottom spec of the new range, 20in, 2ghz, 128mb HD2400 graphics, etc..running Leopard with 4gb ram. When i get into a game, graphics are missing. People, houses, trees, etc...the terrain and gui are fine and i can play the game in as much as selecting an invisible person or thing and moving them. Sometimes they do show up but are completely red. Anyone else had this?