I am having this same problem. I am a new Dorico Pro 5 user. I am running on a Mac. Diagnostic file attached. Any assistance would be greatly appreciated.
Dorico Diagnostics.zip (125.5 KB)
Welcome to the forum, @dave3. I’ve moved your post to a new thread. We’ll need @Ulf to weigh in here, I think, but it looks as if the problem on your system is that the VST scanner, which is part of the audio engine, is crashing when scanning the plug-ins on your system.
Go to /Library/Audio/Plug-ins/ in the Finder: this is the system Library folder in the root of your hard disk, not the one in your user folder. Temporarily rename the VST folder to something else and start Dorico. Does it run?
If it does run, then we know that one or more of the plug-ins in the VST folder is causing the problem. Try putting half of the files back and run again. If Dorico still runs, remove those plug-ins again, and put back the other half. You will soon find which plug-in or plug-ins are causing the problem.
If it still doesn’t run even with the whole VST folder removed, try the same procedure with the VST3 folder.
Welcome also from me, @dave3 .
Daniel already described it already pretty good, but you don’t need to rename the VST folder but only the VST3 folder, since the vstscannermaster only becomes active during VST3 plug-in scanning. Other than that Daniel’s description is perfect.