I think this happened after the last update. When I drag a midi file or midi loop from MediaBay into the project, I get the block and it shows the velocity of each note that should be there, but no notes (very strange). When I set MediaBay to Auto Play the selected midi file, it plays as expected, but there is nothing is there when I insert it into the project.
Edit: This problem only happens if I have “Link Playback to Chord Track” selected with nothing in the chord track.