I am trying to work with QT files that originated from AVID - DNxHD 1920 x 1080. I downloaded the codec package from AVID and installed it on my MacBookPro running OS 10.6.7. I then was able to import the files into FCP 7 and work with them with no issues. However when I try to export the files from FCP they don't play correctly - they strobe and are out of sync! I have tried exporting with current settings and compressing to ProRes 422 but neither worked. The file is large - 174GB....does anyone have any ideas as to what I may be doing wrong and what the solution may be??