I have a MacBook Pro with Mac OS X 10.5.8 I imported photos and videos from a Casio Exilim camera via USB to iPhoto Pictures are as expected Videos are .avi files, which automatically play in QuickTime. However, only the audio plays, no video. Downloaded CASIO avi importer.component from manufacturer, unzipped, and moved .component file to HD>System>QuickTime folder, restarted. Still only getting audio, no video. Suggestions?