I am having the same problem with playback, it stutters like a broken record. I am not panning duplicate tracks. Some days it is fine. others it is impossible to do anything. Shutting down the whole computer does not help. Loading in anther project doesn't help either. It glitches on any song I am working on.
My version is V6.35
As far as the above advise, I don't understand "Have you tried using a different track to load the clip". But I have tried different play back devises. All tracks were recorded on Mixpad and all mixing is on mixpad.
Thanks