I play the Sims 3 on my Mac. I have Ambitions, Generations, and Late Night. I have no custom content. The game was fine for about a week, then the Sims started glitching. Everything else is fine, but the Sims themselves suddenly only have flesh tone colored clothing, their skin seems to be moving, and their faces disappear. My OS is completely up to date, as is the game. I don't know what is causing the glitching. Help?