One of the answers: I had the “no audio playback”
Video play back worked but no audio was coming out of the Macpro, I could change the volume and hear the sound coming out of the computer but JUST not from Adobe Premiere CS6.
ANSWER: GO TO PREMIERE PRO, PREFERENCES, PLAYBACK, and in there I changed audio device to: Adobe DV.
This playback section is where you would change the options to your specific mac, we use a Matrox box which options showed matrox player in AUDIO DEVICE. Once that was changed the audio WORKED again,
Looks like the box was hooked to some speakers which used to work with the old option but with out it….dead sound/no sound coming from the program. I now wear speakers and it works both from the computer speakers and my headphones.