I figured out what your issue is. For each track that is not playing you have the track set to "Force Track to Simple Arrangement" under the individual RealTrack option. To fix this right click on the RealTrack name at the top of the screen or in the mixer and go down to Track Settings. Now uncheck the Force Track to Simple Arrangement option and unfreeze the song. When you generate the song again the track should play.

Let me know how this works out.

Thanks,
Dave