This looks like a similar problem that was described in another topic. I’ve created, installed and used a symbol font. After making what seems a small change to a few characters, testing in FCP and reinstalling in Windows went successfully.
However, when an application tries to use the modified font, there seems to be something terribly wrong with it. Windows character map does see the font in the list, but all the characters seem to be absent. Words gets really confused and seems to want to display a huge font size (the whole page is black when you select what you entered), but no character is actually shown. My own application for which the font was intended is no longer able to show any of the characters - they seem to have gone.
I’ve had this before, and then following one of the suggestions from the other topic (creating a new font an copying all the characters) was a solution. That now no longer works.
I’m stuck. Anyone have a suggestion?