I’ve had issues of working in Dorico with regard to losing my sound feedback. After I perform some edits, layout options, etc, and then returning to Write mode I find out I can not select a note and get any sound output to my headphones. I do have a keyboard successfully connected and go back and forth with using it to input or some computer keyboard input but that does not seem to be the problem.
If I save the file, close Dorico and reopen, then everything works fine. My question: Am I inadvertently muting somewhere without my knowing about it? And . . . how do I get it back on without a complete close and restart of Dorico?
Are you using a dedicated audio device, or the built-in audio hardware in your computer? When you lose sound in Dorico, do you also lose sound from other applications? You could try going to Play mode and choosing Play > Reset All Solo States and Reset All Mute States in case you have somehow managed to mute everything.
Sorry, I did not respond to all your previous questions. Regarding dedicated audio device: Yes, I am using a Shure mic with USB and headphone jacks. It has never caused me a problem. Also, I tried going to Play menu and could not find the exact options you mentioned ‘Reset All Solo States’ etc. All I find is “Reset Playback Overrides”.