ADDENDUM 2:
A couple of things I’ll mention that may help someone struggling with midi export issues.
The first is to make sure that all the desired midi tracks are un-muted including the track parts themselves. When you bounce down all the midi instruments to audio, a common operation, the tracks are automatically muted so that only the audio will play. They must all be unmuted to export the midi tracks otherwise you’ll end up with a Halion track or something.
The second is that, if several windows are running as happens often, the window from which the midi is being exported must be active (activate button on top bar orange) otherwise the same problem of empty export will occur and there’s no warning.
I’ll just mention one more thing. It would be EXTREMELY useful to be able to export the arrange track in order to make clear the song arrangement to the recipient. This seems a no brainer to me but I cannot find any way to have the arrange track in my export to producer packahe. It would be a great addition Steinberg and thanks for all your hard work!