I have an early 2008 Mac Pro 2x2.8 GHz Quad-Core Intel Xeon, 16 GB 800 MHz DDR2 FB-DIMM, flashed ATI Radeon 5870 card, SSD drive with Lion and Windows 7 Home Premium on the partition. Every thing works well. I can play Civ V on highest settings. However, whenever I load a save game at around 200 turns or later many of my farms don't show up. They are there, just aren't visible. I found this problem elsewhere, but only on huge maps. I only play large maps and universally end a game before 250 turns. Very annoying to resume a game with only a handful of turns left and not see the map. 5000 hours of Civ V. Doesn't do this on the Mac side.