Digital noise using Apple 10-bit uncompressed codec for NTSC, BIG PROBLEM!

I hope someone from Apple or the Shake team can shed some light on this problem we're having so we can take the appropriate corrective action ASAP to meet our strict deadlines on this current project.
We're compositing all the EFX (over 1000 EXF shots) for a massive video game project that needs to be delivered to the client by the end of May. Let me preface the following comments by saying that overall, we're very pleased with Shake and the end results we're getting, but one problem in particular has us very worried about making our deadline:
The project is entirely bluescreen with CGI plates, shot on anamorphic Digibeta and captured into FCP as uncompressed 10 bit. 4:2:2 through a Blackmagic HD Extreme card (via SDI).
All the 4:2:2 material exhibits (for lack of a better desciption) digital "noise" that runs along the right-hand edge of the video, with frequent drop-out "looking" sparkles that can appear anywhere in the video image. These artifacts ONLY appear when the video clips are imported into Shake, and rendered out of Shake. They play perfectly fine in FCP and QT player.
If we force the FILE-IN node to 8 bit, the problem goes away, but keying suffers - so this is not an option.
The problem ONLY occurs on our Intel Mac's, not on our older G5's. The reason we invested in the Mac Pro's for this project was to reap the performance boost we desired in order to get the project out the door by our deadline, plus the G5's are busy offlining upcoming episodes - so turning the compositing over to the G5's is also not an option.
We're already well down the road, and while we realize that at Shake's current price-point it seems silly to complain at all, we gladly would have paid more for a compositing tool if we knew we were going to run into a situation like this. Unforunately, our initial evaluation of Shake was done on our G5's which don't suffer from this issue.
If anyone from has any recommendation for an efficient way to solve or work around this issue, we'd love to hear from you.
Best regards,
Michael Buday

Not sure the exact answer, but some options to try:
1) have you tried converting the clips to image
sequences? Perhaps it's a QuickTime error.
2) How about using 2 FileIns - one at 10 bit to
generate the keys and one at 8 bit for the fill?
Patrick
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Hello Patrick and thanks for your suggestion:
We're going to experiment with different codecs and image sequences this week to see what happens.
RE: using different FILEIN's for key/fill, is something I hadn't thought of but unfortunately the 10bit FILEIN would still be affected by the noise which would in turn affect the alpha channel created by Keylight or Primatte.
I'll let you know what we find out as things progress.
Again, thanks.
Michael
G5 Dual 1.8 GHZ Mac OS X (10.4.3) FCP 5.03, STO 1.01

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