LOL ... not sure what Noah is on about with the "some sort of plugin is still in your QT player prefs or whatever." line but I'd say he's generally on the right track as in you've not actually uninstalled the quicktime component that is causing your issue.
It sounds like you may have installed Calibrated Q's XD Decode component (which is NOT compatible with FCP installations as it directly conflicts with Apple's own HDV codec bundle) ... if you "manually" uninstalled by deleting the XDOptions app and associated docs then the codec is still installed. Go into your
/Library folder (at the root level of your hard drive) and then look inside the QuickTime folder therein ... do you see a file named
CalibratedXDDecode.component ? If so then you need to trash it. If not then please list for us all the codec you do see contained inside that Quicktime folder.
Or... if you're the give me an easier way kinda guy (and aren't we all) then go ahead and check out the free demo of Jon Chappells excellent FCS Maintenance Pack ( [
www.digitalrebellion.com] ) which contains a tool called
System Toolkit; launch that app and switch to the Quicktime tab and you'll see a list of all the QuickTime components you have installed, spot the culprit, select it from the list, and click either the "Disable" or "Remove" button :-)
Best
Andy