A General MIDI Patch will not load to a song. I'm using 2015 Build 414. When I select an instrument on the patch list (Select MIDI Patch>Select General MIDI Patch or Select GM2 Patch) and click OK, nothing happens; the track remains blank. Songs that I built with MIDI patches prior to upgrading to 2015 still play; I just can't add a new patch to an empty track in 2015.