I created an Indesign CS6 document (334pg book) and used ITC Garamond Bold for the document subheads. This was done with a paragraph style. After editing the document I get a missing font warning for ITC Garamond Bold. The font is activated on the system using Suitcase Fusion 4. If I create a new document the font is available. Both documents open. One shows the font missing. On a Mac OSX 10.6.8. Any ideas on fixing this missing font error?
Why not obtain FontFingler or FontNuke and run these font cache burping utilities and see if the problem goes away? Is it installed in more than one place? Does one of your documents have a Document Fonts subfolder and the other doesn't? Did you maybe try to Export the afflicted document to IDML, and then turn around and re-open that file?