As far as I know, my colleague is using 2012 build 349. I'll check with him.

The exercise we're going through at present is to update our repertoire, previously MIDI only, to use RealTracks wherever possible. Our procedure is to open each MIDI-only file in turn, change to a RealTracks style, play it through to test the arrangement, freeze the tracks once a good arrangement has been reached, and save it as a new file.

Next time we meet, I'll go through the process with him again, but it seems odd that he could be using RealTracks for the arrangement, inadvertently switch RealTracks off when he saved the file, and turn RealTracks on again for the next piece.

Would it be a case of his using Opt.=>Preferences=>RealTracks to disable RealTracks before each save, and the same route to enable?