Hi @ah309 , please open a non-sounding project and then open the Dorico Mixer window (F3). Is there any channel set to mute or solo state? Does the level meter of the master output channel flicker when you start the playback?
Confirmed that VSTAudioEngine is no longer crashing so marked the post above from @Ulf as the solution for that. Thanks again for the debugging session - seems I’m left with a NotePerformer expression map issue which I’ll hunt for a solution for, and post a new issue if I can’t get anywhere.