I have the same problem (extensions greyed out) on my iMac. My Macbook Air is set up the same way and has no problem.
Also on iMac Extension Manager does not show any applications, but Air shows both PS CC and PS CC2014.
I have the same problem (extensions greyed out) on my iMac. My Macbook Air is set up the same way and has no problem.
Also on iMac Extension Manager does not show any applications, but Air shows both PS CC and PS CC2014.