I am having a similar issue, I have a project within dv ntsc content, on the timeline the playback is smooth but after rendering, whatever DV avi or m2v the video stutter, some frames are repeated, moreover when I review to compare both files, the stutter appear to be random, not the same timecode frame lost in both videos.
I have tried in two different pcs with no change.
I would like to know if Michael McQuilkin was able to solve this madness.
highly thankful.