[jodyjfk]

Bio:
I downloaded your file but have not been able to check it out yet due to an intense session I'm involved in at present.
I could see this test being helpful to suss out the BTD problem. Is it a bug or system dependent?
A couple of months ago I wanted to see if my system had the BTD "bug", so I took an existing session of 16 tracks (with no plugins) and added a stereo D-verb to each track. It played fine but would not BTD. I haven't done any mixing since (just insane amounts of recording and editing). I figured I would work on the problem when I had to actually mix this project.

Maybe you could post your results? (or is the laptop the only system you're using?).