Hi Bob
The tracks concerned don’t play in ITunes either. I copied the ITunes library whole.
Tonight I went through some of the tracks that don’t play and copied them manually, one by one, from my old ITunes and put them next to the original in the various playlists. The new tracks play both on ITunes and VDJ 8, plus strangely, often the track/version that previously didn’t play now does? What I did notice that a number of the tracks, not all, were purchased via ITunes but I had changed the track title by adding a date. Maybe that helped throw ITunes off course a bit?