I created a new song, wrote a few bars and tried playback… no sound.
Tried changing various settings in Playback device… still no sound.
Reinstalled Dorico… also no sound.
Deleted the VSTAudioEngine3 folder and restarted Dorico, same thing.
It keeps complaining about a missing playback template whenever I reopen the file.
I also generated a diagnostic report, although I have no idea about where to find it.
Created a new song with the same instrument, and now I have sound, but the song two hours ago still have no sound.
Copying all the notes to the new song fixed the issue, but at the cost of a few hours lost debugging, without actually finding the root cause.
I hope my new song will continue to have sound.
So limited time for being creative, and you end up spending it on broken tools, what a bummer