Thanks for the information. This sounds pretty strange.
Are you able to connect your H90 to a MIDI monitor on your computer? That would be the best way to troubleshoot this further. You would need some sort of interface to connect the DIN output to your computer via USB.
Another simple test:
The H90 will always send a PC message when you load a new Program from the Playlist if MIDI output mode is set to Transmit.
Can you try connecting the H90 directly to another device that will receive PC messages and see if this works?
