I can tell you right now, its because you had 6.5 QT on one system that had a mpeg2 plugin put on it, then it was updated, that why you can use it, and its way better then compressor, my compressor takes 4x-5x longer to render then that plugin, I dont understand why that guy said make a REF file first, then whats the point of Final cut letting you send the file right in compressor? The quicktime plugin is faster I feel even if its the same as compressor, I see a differnce in speed. You can’t add the plugin in 7, and I’m trying to down grade my QT 7 to 6 so I can use it on a newer machine.