[Darryl Ramm]

Oh and to see what snapsots might be left on your computer after each backup you use...

$ tmutil listlocalsnapshots <mount point>

Like

$ tmutil listlocalshanpshots /

if looking at the root/boot/system drive.

Assuming the issue here really is related to snapshots. then why Pro Tools fails with an assert just because a snapshot is taken is unclear, it's possible it's checking (calling an assert) for something in a non-standard or very subtle way. In principle Pro Tools should just keep running... a test would be to reproduce this by just taking a manual snapshot with tmutil. In which case I'd hope that is something that Avid would treat like a bug.