after reading your post the first thing comes to mind is do you have the latest 2.0 drivers installed? and i just received a io with old firmware so i would also insure that you are using the latest firmware. you can do this by downloading their control panel and runing it. then select “update firmware” if it is out of date. If that don’t fix the problem make sure you are using the latest version of tiger and quicktime. go to software updates from the apple taskbar icon. and if that don’t work re-install Final cut studio.