I apologize.
The problem wasn't with software nor hardware, totally user (my!) error. DP was set with "Multi" off (where DP gets its midi input). The input read "any". I hid the input information in the track view and forgot about it. But when I examined the mixer view, I could see that "any" had actually meant that somehow midi data being sent to my other computer (via midi over LAN) was being seen by DP as input to a soft synth, to Dune! I cannot believe I made such a mistake, uh, yes I can. When I switched "multi" on, I could then CHOOSE to limit midi input on every midi track to my attached keyboard, the way I want it and thought it was. This resolved all the midi problems that had me changing cables, reinstalling drivers, and not finding the real issue until many other fixes were attempted. I'm sorry for wasting your time.
Dune is great, it's solid as a rock and the patches are among the best I've ever used. It is also a joy to program, I love this synth! Thanks for creating it!
Best,
Jerry
www.jerrygerber.com