As has been mentioned above, previous versions for the Mac allowed the anti-aliasing setting to be turned on, if ineffectively - which was vital as the presets graphics settings involved anti-aliasing. This one generates a white screen if anti-aliasing is on - move the slider to "High" or above and it will do this. For those meeting a white screen which they didn't previously have, there are no hints as to the solution. This is, you know, a serious bug. Was this version tested?