[jasonthurley]

I had that happen on one song in the past 3 years, where the MIDI was spot on the grid and after so long of playback at a certain bar the midi seemed to get out of whack... same session on multiple versions of PT yielded the same results, however I have many other sessions using the same template of VI's and longer song length with no drift. Not sure if this is corrupt session data or corrupt VI automation data, but it is rare that this has happened for me, last time I saw it before this session was like 5+ years ago.

May try making a fresh new session and importing all the session data from the drifting session to see if it solves the issue.