Video distortion when outputting to QT
I am running FCP 7.0.3 on a Macbook Pro. I am editing a sequence that is 1 hour and 48 minutes. The first image is text over a field of black, the second is a tif of a logo, and the third is video. When i try to Export a QT video using FILE / EXPORT / QUICKTIME MOVIE / 'Current Settings," when it gets to the video, there is a field of green, then some pixilated video distortion, then the video seems to flicker back and forth and go back a few frames like a stuck record. I notice that sometimes when I am playing the clip in my timeline, it tends to get a little bit "stuck" when it goes from the tif to the video. It seems to jump a few frames ahead, but there is no video distortion, that only shows up when i expert the entire video. I have also broken up the sequence in to shorter clips of about 15 minutes and the problem seems to go away. Any insight greatly appreciated.
Final Cut Pro 7, Mac OS X (10.6.8), null