I am having this problem on two different machines (I go back and forth w/ my Steinberg key) - they are the two machines listed in my signature.
When I attempt to quit Dorico, I just get “application not responding” for an interminable period. If I use the OS to force it to quit, I need to reboot to get it to load again.
I am not sure if there’s a way I can get a diagnostic to share in this situation, since it is isn’t outright crashing.