valid font

Fixing a font that doesn't appear to be a valid font file

I have a semi large type family that has a problem with installing certain fonts that receive an error stating that they are "not a valid font file."

The type family is set up with 3 sub families like this:




If you google "was not a valid fontfile", you'll discover a host of problems and solutions from the users end. But my issues only seem to effect the 'alt2' sub-family of the typeface which makes me think this is a problem caused on my part.

When installing the complete typeface, it only seems to effect 1 or 2 fonts in the alt2 sub-family, and not always the same two.