Bad news. In order to play private tracks, it is necessary to supply the access token in the url. This must be done using SSL encryption (i.e. HTTPS). Unfortunately, the audio player component does not support streaming via HTTPS. I tried using plain HTTP, but the server returns 'Bad request'. This means that it will not be possible to play private tracks within the application. You can still download them and play them from the archive. I will add some code to handle attempts to play private tracks.

Regarding the track that was not displayed in the results: I notice that there is an 'Apps enabled' setting when you upload a track. Is it possible that you disabled this for the track in question?