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
I remember having similar issues setting up audio workstation DAW's for Slave/ReWire. Sounds like GarageBand took control of your Audio Card and set it to a different "Sample Rate" which would speed or slow the audio being used in other apps.
Sounds like you'll have to use GB either before or after Ae/Pr to prevent this... or figure a way to set your sample rates to match.