One session playing back audio at wrong speed

[vitolanzafame]

Hello people

Today i opened up a session that i was working on last night, and the audio is playing back slowly.
I checked with other recent sessions - they are fine.

I'm working an my macbook pro retina 15' using pro tools agregate. (in the back of a van)

Using PT12 2018 latest.

Something which may have caused this was that i had a pair of bluetooth speakers connected when I first opened the session - perhaps it saved some kind of new sound settings triggered by these headphones? I've been playing around with the agregate settings, tried rebooting etc, no joy.

Does anyone have any clue as to where to look within this session to see what's causing this and fix it?

Many thanks

Vito