This was driving me insane all week.
I was creating scores with Garage Band.
And Pr and Ae were playing back audio & timelines AT THE WRONG SPEED.
As I was on the phone with tech support, I realized this was caused by Garage Band being open!
As soon as I quit it, CC went back to normal.
Anyone who uses GB -- let's please file bug reports.
ADOBE AFTER EFFECTS PREMIERE CREATIVE CLOUD GARAGE BAND MAC AUDIO SLOW SYNC PLAYBACK ISSUES SLOW