Take this with a grain of salt ..
I would assume from the clues that the font is not correctly installed (or corrupted). Unfortunately, a re-install is the only way I know of to correct this.

I haven't found the PGMusic fonts as a separate item to 'install' (as suggested by solidrock above). At least not in recent versions.
Maybe others have more insight.


I do not work here, but the benefits are still awesome
Make your sound your own!