Rubberfingers - Thanks but yes - I did mention this in an earlier post 
Paul,
Hi Paul,
Can promise Iâve tried it with no apps running apart from Dorico.
The M-Audio Midisport 2x2 (anniversary Edition (ie the latest model, compatible with Win10, which I why I bought it to replace my old Roland UA25) is a very simple MIDI to USB interface - one of the commonest out there, I would say. Iâm pretty sure there is not control panel or other acces to parameters that might be altered. Would be interesting to know what interfaces others use.
Scores (created with Dorico 1 before I upgraded last week) play back fine.
I (in my non-scientistâs way!) understand that a signal flow from a keyboard to a piece of software shouldnât allow the software to affect the hardware, but Iâve seen with my own eyes many times this evening the following two patterns happen, consistently:
Load Cubase: lots of flashing lights on interface, throughout launch process; then green light on the correct channel when I send MIDI data to the DAW ( viz., by pressing a key on my keyboard)
Load Dorico: Flashing light for PART of launch process; by the time Halion SE3 window has appeared, all activity on the MIDI interfaces has halted ( though the POWER light - separate from the signal light - stays lit) When Dorico is loaded, pressing the keys on the keyboard no longer lights the signal; light on the interface - ie no MIDI is going through it.
I quite used to troubleshooting problems with standalone software like Reaktor/Kontakt ( I have NI Komplete) But in those cases I see MIDI flshing on the interface, so I know the MIDI date is at least getting as far as the interface, and I need to find a setting in the software to alter.
I thought this would be the same, but a) there seems to be nothing in Dorico to monitor or tell the user whether Data is being received (other of course than the total failure to work which isnât very useful as a diagnostic tool!) and b) It does seem to me that something is happening that is telling the keyboard or the interface to stop transmitting MIDI data. ( My keyboard is a Kawaii MP 9500 piano and I (have just realized) donât have the midi IN connected.
Is it possible that there is some sort of handshake routine between Dorico and the Keyboard or interface that is failing and causing the Midi generating keyboard to shut up shop if it doesnât get the right response from its target?
The problem vanishes without any intervention (donât need to reboot or anything) if I simply open Cubase after Dorico has failed.
Thanks for being bothered about this - itâs driving me mad. ( But not back to Sibelius yet!)