What I wanted to do: Klick into the first a bar of a system, hit “,” to move the bar to the previous system.
But: I had “Staff spacing” activated in the left panel.
This is reproducible:
Open Engrave Mode, activate the “Staff spacing” button (3rd in the left panel), click into the first bar of a system, press “,”.
Dorico thinks for a few seconds and shuts down.
I’ve created a Diagnostics Report, if it can be of any use for the team.