Assertion error when attempting bounce to disk
 

Hi All,

I'm on PT 9, MacPro tower, OSX 10.6.8 8gig ram. Very large tb drives, internal. Stable as can be for years.

My issue is this, on any session I have created I can easily bounce to disk, never any trouble. I recently got 12 sessions from another engineer. Don't know which version of PT he has. I can open the sessions, overdub, edit, mix as normal.However, when I ask to btd in any of them, I get this window (as an attachment below). It seems to me to be a setting in PT but I have tried many in the session setup pulldown. Not sure where to go now, any Ideas? Thanks, Bruce