Howdy Herbert,
Ok, something weird is going on here. I just did the following:
1. Opened your file.
2. Click Staff/Setup
3. Highlighted the Staff name.
4. Typed in "Herbert" - see that it changes in the Staff Setup dialog.
5. Click "Ok." to save and exit
6. "Herbert" now shows in the score as the staff name like it should.
Am I missing something?
My best suggestion at this point is to re-install the latest version (Composer 2.6.3) again, restart the computer, and see how it goes.
ttfn,
Sherry