Oh my oh my … the e455 works ok for viewing, but not for editing.
When I make a change to an existing score, or create a new one, and save it, the next time I open it, the program closes down and disappears, just like it did with my older version.
Thank you Andre for your reply.
I would like to try the 4.5.5 version if you let me have it.
It that would work, I would be saved, and can continue working with Encore.