Green line and flutter at bottom of screen amidst slowmo dissolves.

I'm editing a wedding shot on miniDV at 30i. As with most weddings I use a lot of 50% speed with frame blending and a lot of dissolves. I've noticed that during some dissolves I get two pixels of what I can only term as flutter on the very bottom of my screen. This is especially noticable generally when I'm going from a bright shot to a dark shot or vice versa. It doesn't happen all the time but it happens very frequently. I also occasionally get a green line that renders for a single frame at the bottom of the screen.
I should note a few things: first, this doesn't appear until I actually render the dissolve. In realtime effects they all look fine. second, the problem is totally consistent even if I rerender. I will always get the same flutter or the same green line at the same time code in the sequence with the same clip every time.
I've only begun my investigations into this problem, but I believe it's a field problem of some kind in that some bug in how FCP renders is not handling the fields properly. I plan to submit a detailed bug report once I narrow the problem down further.
I tried changing my sequence from bottom field first to no field dominance and the problem disappears. My final format is DVD so my question to the gurus out there as a fix for the time being is: if I render my entire sequence with no field dominance and then export it and compress (using something other than Compressor 2 which has known blockiness issues) and in the compression program specify bottom field first will the fields split back out fine without causing some other issue just as if I'd always had it bottom field first? In theory I would think that should be the case.
Also, is anyone else experiencing or come across this problem?
Dual 2.7Ghz G5 1.5GB RAM Mac OS X (10.4.3)

If that is the concern, either crop the offending clip by a couple of scanlines, or use Andy's letterbox generator (in downloads on http://www.proapptips.com - you may have to register, but the plugin is free), and throw it over the offending section...
Patrick

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(Sorry for my bad English)
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Green line and flutter at bottom of screen amidst slowmo dissolves.

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