TI polar hardware midi out not working

[RonF]

Whether on 50300 or 50402....my polar's hardware midi DIN out port is not functioning correctly.

With NO USB attached....only audio cables and power and midi out (no midi in, so no midi loops!) attached... The out port sends bizarre messages. Using midi monitor on my mac, I can see that its not sending note data....rather its sending system realtime messages ON NOTE PRESSES from the polar keybaord. I have tried installing and reinstalling both OS's, same behavior each way. I have of course tried different midi cables and destination ports to be sure its not something silly like that.

I've also tried a hardware reset (Arp Edit from sleep), to no avail.

Any ideas?