Confirmed - same 2012 build, and the same RealTracks.

I've also found that he has been having the same problem in playing back the songs he's converted to RealTracks as I have, although those that I send to him work as they should.

It looks as though his copy of BIAB is failing to save the RealTracks component, and causing all this trouble.

I've suggested that he should try Opt.=>Return to Factory Settings. If that fails to resolve the problem he'll probably have to uninstall BIAB, clear out all other BIAB-related files, and install again from scratch.