I have been editing with FCP hd 4.5. Just had a MAC specialist upgrade OS from 10.3.6 to 10.3.9 and QT from 6.5.2 to 7.5 in order to read MPEG-4 video files. Now FCP Application will not come up — gives message, “The application FCP has unexpectedly quit.” Do I need to uninstall and reinstall FCP?