Export, and publish (including the preview keyboard shortcut) have suddenly stopped working. The problem has affected two recently created files but older files work as normal. When I publish or preview a file the export panel appears but then flash freezes and I have to force quit the application. I tried to save the file as a CS3 file and this caused the application to freeze in the same way. I re-installed and used clean script but this didn't work. I'm using an iMac (intel) 5,1 model with OS X 5.5.7. Has anyone encountered similar problems and if so how were they resolved?