We still have several users here who are clinging to Adobe Illustrator 10 for various reasons. Among the problems with Ill 10 is the corrupt AdobeFntX.lst issue, where periodically these files ...

Open Suitcase's main window and deactivate all non-system fonts. Quit Suitcase. Do a Finder search for any files ending with ".lst" in the filename. Delete as many as your user permissions will allow.