Why can't I choose full screen mode in Photoshop CS6? I am using a trial version of Photoshop CS6, and I can't choose full screen mode. I am running OS X 10.9.

 

What's wrong?
Make sure there is a file opened first, if photoshop is "empty" the options are indeed grayed out even in the registered version of photoshop cs6.

Let me know if this fixed it