Er...no problems here on my 600 iMac, but i just noticed the other day that whenever i try to go into multiplayer, i get a couple weird boxes on teh screen, like a error dialogue is opening, but it never shows up,so i hit Esc and get back to the main Wheelscreen...weird, my friend noticed the problem the same day, though it was the first time either of us tried, cause we were gonna go head to head.