For some reason on my 1Ghz iMac, and a 466Mhz iBook, if I allow the game to sit there until my screen saver activates, it causes a kernel panic. Very repeatable, just takes a while for the screen saver to activate. I think it's just a bug with fulscreen mode and two apps trying to vie for control at the same time because it doesn't happen if I run it in windowed mode. Just a notice.