In mac if you make a new non-admin account and reintall cx games 7.1.1 and TF2 then go set the proporties and the launch options keep the default and add at the front "-dxlevel 90 -w 1280 (this can be 1280 or 800 if you have a 15' macbook pro 1280 will make it full screen) -h 800 (or 400) then it lags sometimes a little but other then that it works fine :) at last