For some weird reason, I have a new problem with my (private) Chords Font, that always worked fine.

Just now, the "slash" vanished. It's in the font itself, but for some reason, Finale doesn't see it anymore. It worked until recently.

I wondered what happened and tried another Font of mine, and first I could see the slash there...  but then, after re-start this ALSO was gone!

 - -

Does anyone have an idea what this could be? Any similar things...  

I would be grateful for some hints.

(No, it's not the symbolFonts.txt file)