I'm on maya 2013, running it on a mac. When I tried to download maya 2012 and downgrade to fix the problem, it told me that my OS was too advanced during installation, and that I could only use OS X 10.5.x and 10.6.x. So apparently my machine can only run maya 2013. Should I just try uninstalling everything? Maybe it's a driver issue? I'm not sure. This seems like a pretty unique little glitch I'm experiencing...