Just wanted to post an update on this issue. The suggestions from Kent at support was to:
1. Reset BIAB to default settings by deleting everything in the Preferences folder.
2. Run BIAB from the EverythingPAK drive rather than from the installation on my computer.
After doing 1 & 2 and testing it out (as well as trying to render to WAVE and Ma4 as well as AIFF) the rendered files still had the same errors. Then for giggles I tried running BIAB by plugging the EverythingPAK drive into my older Macbook with OSX 10.5.8. My first 3 test renders returned files with no errors and I thought I was home free. But the fourth test had the same sort of errors. So for now, since I really need to get usable audio files done, I have gone to the tedious work around of dragging the tracks into Garageband and making them there. At least it works. I would still like to get this issue addressed, so I’ll let Kent know the results of my tests. Here’s hoping they can come up with a resolution short of me upgrading my version of BIAB…which I simply can’t afford to do right now.