okay. just figured how to open a « saved » score (work-around). after working on a score,
from the Inspector panel, click on any other score, say an example one, to open it,
and the pop-up dialogue appears asking if you’d like to Save Changes before opening the other one…
well heck yeah i do.
so, obviously click Yes, and then reopen your new awesome score in the same manner.
Using File-Save from menu bar is the part that doesn’t work, possibly because there’s no pop up dialogue asking for name and place of your new score.