My primary monitor is set to the 27" at 2560 x 1440.
I can't window and unwindow (command + m) either. what to do!?
Well I figured out that you can just do "window full screen". Only problem is that playing liek this is really annoying since your mouse goes outside the window, and the performance degrades. :(
Game should open in windowed mode and allows you to change it to full screen mode and choose resolution.
Make sure you have write access to the