REALLY Mysterious Gray Lines on Every Export (pictures)

I'm working on a video that contains a white background, and the client's background is also pure white. Every export I give him has a gray vertical line showing on the left and right borders of the video. We've narrowed down every possible cause, and it comes back to me.
Here's a picture blown up 1600% of the gray line:
I moved the video over a couple pixels:
It exists with every export that I do. .MOV, MPG2, etc. The gray bar won't go away. I tried scaling it up and re-rendering, but the gray bar still exists.
Any ideas?
I'm also on CS4 (the forum there wouldn't let me post). I'd really appreciate any experience you can offer with this.

Everything was exported from AE as .AVI uncompressed, the sequence is 1080p, 29.97, and I've tried almost every export format, typically at 12Mbps.
I found out that the issue only exists on a 1080 export, but the same format in 720 (exact same settings besides size) does not have the gray lines. With other videos, the color (not pure white) distracts from these lines, but with a pure white background, the lines exist as like a half gradient on the left and right sides... but not the top and bottom.
I understand how crazy it sounds, but it exists with every single 1080 render I've done. Could this be a CS4 issue, and I should just upgrade?
Thanks for your consideration.

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