Video "Hits" After Rendering

After I render a piece of my timeline and look at it on our studio monitor, I'm getting a good amount of what I would call "hits" in the video, like hits you would see on an old tape that's past its prime. The timeline has a number of graphics layered on top of one another with text and moving jpegs, with a broadcast safe filter on everything.
I've had weird things appear after rendering before, but they've always gone away after rerendering. This time they're pretty consistently in the same spots.
Any ideas about settings I should look into or other work arounds?

I have seen this on several occasions and there seem to be a few causes.
possibilities:
1) you are using the Broadcast safe filter, if the clipping on your images are extreme you get strange green and white artifacts after rendering. Try using the 3-way color corrector to bring levels down before applying the BS filter. Or if the artifacts are occurring on graphics, make adjustments in Photoshop (or whatever program you created the graphics in) and bring them back into FCP. A lot of people create graphics using the full range of RGB colors and luminance values. NTSC video does not have as large of a chroma and luma range as RGB.
2) You are working in an uncompressed 10-bit sequence and applying filters that are not compatible (for lack of a better word) with Apple's 10-bit codec. (Or you are just getting random render problems in 10-bit). I have had many, many render issues in 10-bit that went away by switching to 8-bit. In most cases you can't really see much difference between 8 and 10 bit video anyway, so why go through the hassle or working with it. If you are doing a lot of green screen work, you may want to reevaluate this argument.
I'm sure there are other possible causes for the problems you're experiencing, but these are the ones I've run into in the past.
Graeme Nattress knows a lot about 10-bit issues in FCP, perhaps he can chime in with some suggestions/explanations.

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Vid Rate 29.97 fps
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Comp DV/DVCPRO-NTSC
Data Rate
Pixel Aspect NTSC - CCIR 601
Anamo
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Tracks 1V
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Pixzl Aspect Square
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Field Dom. Not Set
Alpha None / Ingore
Rev Alpa
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Video "Hits" After Rendering

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