Audio issue in PrePro 6
 

Strangest thing EVER!! I have upgraded to Premier Pro6 and am working on my first project.

When I first started there were no problems...then I let the screen go idle and answered some emails. When I returned the audio didn't work on ANY clips in any windows?!? I tried everything.

Eventually all of a sudden the audio was fine again. Since then every time I leave the project and return the audio doesn't work again. It's still there and I can see the waveform but I just don't get any actual sound?

Any ideas??