Great game, but has some issues in the mac adaptation. It seems that upon quitting and restarting the game a few times without restarting the OS, the mac mouse pointer just gets stuck on the screen on top of everything else, which can get quite anoying. Same issue on both the 2010 macbook pro and the 2012 retina macbook pro under OSX 10.7, 10.8 and 10.9.
Please fix it as I would hate to see such a great title by ID software get spoiled like this...
Thr Monk about Quake 4 ™, v1.4.3