Systematic Pixelation in mpeg2 After Compressor

I shot an event included in which are a series of 4 speeches (SD, mini-DV, 29 fps, Sony pd170). All four speeches look fine on the source tape and in FCP (v 6). They are typical head & shoulders speech shots. The total runs time for the project is ~50 min. The issue comes up at 32:30. After exporting from compressor (the one that comes with FCP v 6), a section of 2 of the speeches shows complete pixelation for 1-2 frames. This occurs every 13 frames for approximately 10 minutes. Then the video returns to its normal pristine condition. I have re-compressed a number of times to no avail. I have never seen this before and am dead in the water. I need to get this into DVDSP (v 4.2) this weekend. I have not inserted extra compression markers--this is not a high speed video (and the other speeches came out great).

thanks for the reply.
I am judging my video by playing it back in the Viewer, when I add it to a track. I haven't burned the DVD yet.
Here's what I'm doing:
Export from FCP to Compressor (this is a single 5 min QT movie file, that I captured straight from my DV cam to FCP)
my presents in Compressor are: 1 pass CRB,
mpeg2 elementary, NTSC CCIR 601/DV, 29.97, frame controls: automatic, 4:3, Average data rate: 4.5, bottom first.
HOWEVER, I have also followed the same steps on another 5 min FCP project, this one consists of
multiple clips from several different sources, with effects, filters, much more complicated, and it looks great ... with the same settings as above.
Don't know what is the problem with the 5 min QT movie.
After compressor, it looks like bad vhs video.
Any ideas?

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