I recently opened my publication (12 page monthly magazine), and the message window said my fonts were unavailable, including one I paid for online. I had to replace "Times New Roman, "Arial", and others with "Helvetica". What's going on? The fonts are in the font 'list', and work okay in my MacBook Pro "Text" processor. I have InDesign 5.5. I've never had this problem before. Could it be related to an Adobe Acrobat Update?