Poor quality on multiple level video export. What am I doing wrong?

I'm having a problem with exporting a video I've been working on with FCPX.
The output file looks like it's being screened on a venetian blind with very small slats - ie the image appears to be made up a lots of narrow horizontal panels. I also get a kind of striated effect around all the edges (which I managed to eliminate in my latest attempt - see below)
The video looks fine in FCPX - it's only when I export Media that I'm seeing this problem.
The sections that I'm having this issue with consist of a background texture generator in the Timeline, and two layers of video clips above that. The video clips are resized and positioned top left and bottom right of the screen (overlapping in the centre), so that you can see two separate video clips playing over a background. At different points one or other of the clips expands to fill the whole screen.
The clips are variously original clips, compound clips, and a compound clip with slo-mo video in it.
(The reason for doing this is that it's 2 cameras following 2 separate, but simultaneous, processions. Sometimes I cut between them, but I also want to see both processions at the same time during the piece).
I've tried exporting using standard settings, Apple ProRes 244, and h.264, and I've gotten the best result so far by exporting to Compressor and using MPEG2 for DVD settings, with De-interleave turned on and giving it two passes. That got rid of the striations, but i still get the panel effect.
If I export a different section of the video, that only uses 2 layers of video (without the background generator, and with one layer of video in the Timeline), then the resulting export looks ok even with a standard settings Export Media, so I'm assuming that it's something to do with the attempt to give the images a background. This also may not be the best way to go about this, so I'm open to suggestions about _how I should do it!
If more info about how I've set up opacity etc is needed, let me know.
thanks for any help
David
Editing on a Mac Mini with 8mb ram (FCPX runs faster than on my MBPro!); FCPX1.1

I'll just add that I reimported my footage, using the Optimise media settings, and exported a short clip using Export media (ProRes 244) & Compressor (ProRess244 + DeInterleave filter). Neither showed the "venetian blinds" effect, but the first export had loads of fringing, and the second had a lot less, but there was still some visible.
Anyone? Is this a bug or some kind of operator error?
thanks
David

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