Derek,
This may be a silly suggestion, but what happens if you File>Place the file in a new document (temporarily having Paste Remembers Layers ticked in the Layers palette flyout dropdown of the latter, if there are multiple layers)?
A few other, possibly just as silly, ones are to
- Uninstall/reinstall the font
- Clear the font cache; instructions may be read here: http://www.fontmarketplace.com/info/font-help.aspx; there are font caches clearing applications for Mac, searchable with the search term clear font caches.