I am here...

I will look into your problems.
I don't understand you not being able to play, unless maybe you haven't configured a Midi Out device. Harmony writes a MIDI file, then calls the Windows MIDI control to play it. If it writes the file OK, then the problem is in your Windows configuration. Try Export to MIDI, and then feed the file to Windows Media player.

PS you will be impressed by the next version, 3.3.8, in which you can move or copy notes by dragging existing ones from the score. Available soo, watch this space.