Hi Noel,
I confirm that I am already running build #804 and that "File | Open Special | Open MIDI file" and "File | Import | Import melody from MIDI file" do not work at all.

The"File | Open" command seems working as with previous BIAB releases, but I have founded some new problems:
1 Some track/channel are not shown in the Melody sequencer, mainly Drum related. The problem appears randomly with different MIDI Files.
2 In the Melody Sequencer the option "Play None" does not work. Tracks are always playing.
3 When moved a Track from Melody to Utility, the relevant notation windows does not highlight the played note and the option "show note names" is not working.

I really think that the MIDi behaviour of BIAB 2021 should be completely revisited.

Best Regards.
Fedro