HDV Render: blocky sequence results!

I have a LONG project with two sequences. Both contain three video tracks: two HDV (regular 1440x1080 60i preset) and on DV (720x480 anamorphic). On both sequences, I've used opacity ramps as "cross fade" between the tracks and the three way color corrector to deal with some lighting uneveness.
When I render all Act 1, it says "Conforming HDV," it takes about 4 hours (one hour and twenty minutes in the sequence), and the result is just fine.
When I render Act 2, it says the same things, takes about the same time, but the results is VERY blocky looking, jittery, etc. in the sequence viewer. If I just look at a clip, it is fine; the render files viewed with Quicktime are blocky like the sequence, so it is a real problem.
I've tried forcing it to render again, but there is no change.
Any clues?
FCP 6.0.2; OSX 10.4.11, QT 7.4 on a Mac Pro G5 2.5 Quad.
Eddie O
Message was edited by: Edward A. Oates

I solved this problem.
I had a slug at the beginning the the act 2 sequence, but not as part of the act 1 sequence. I guess this such a slug disrupts the HDV conforming process. The successful act 1 sequence had a DV clip at the start of the sequence, so apparently a generated video section is problematic.
Once I eliminated the slug by putting a short HDV clip in its place with opacity set to zero, the full render was successful and the clip is sharp and clear as expected.
I'm marking this question as answered; those editing in native HDV take note.
Eddie O
PS: there are many who wisely counsel against editing in HDV and advise transcoding to ProRes or other format. Since I don't use any chromakey techniques (yet), there seems to be no particular advantage for me; HDV edits smoothly enough on my G5 Quad, and conforming (I only do it once at the end of major editing) takes about as long as transcoding without a hardware assist on my machine. And I get by with 1/4 the disk space and can play back more streams with just a regular firewire (7200rpm FW800) drive.

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