Vertical lines showing up after rendering chroma key on Canon 60D footage...

Ok so I am working with Final Cut Pro 7 right now and this is my first green screen attempt.
1) I shot the footage with my Canon 60D and did a log and transfer so I could make the H.264 files into Apple Pro Res 422, the correct method.
2) I then applied Color Smoother 4:2:2 , then Blue and Green Screen and selected green, then Spill Supressor, then Matte Choker, then Mask Feather. After tweaking the parameters throughout the filters I came out with a perfect image.
3) I then tried placing another ProRes video underneathe of the clip so that the video would show in place of the green. It worked and looked great.
HOWEVER
4) Upon rendering and playing back through the final image I noticed vertical lines running down the 60D footage. At first I thought it was the image underneath coming through, but even after removing the image and simply using chroma key until the green turned to black and rendering again, the lines were still present. Am I doing something wrong?
Please help, I have a deadline
-Eric Widder

The HQ flavor of ProRes is overkill for this footage (I also have this model Canon), but that's not really important to fixing your problem.
Further to what Rv told you: I've long been advised by people who are savvy about keyers to avoid the stock FCP keyer and use the Primatte plug-in – and that's been my go-to tool. Recently, I tried the new keyer in Motion5 and was very impressed. I tested it on a project I'd been only OK about and found it made a huge difference. If you're going to do a lot of this kind of work, check it out. For $50 the keyer alone is worth it.
Russ

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