Intermittent problem with cross dissolve and chroma key

It seems that in 1 out of 10 videos I produce in Final Cut Pro there is a problem with the cross dissolve effect and chroma key. What happens is that during the cross dissolve, clip A fades out with a green tint and clip B fades in with a green tint.
Today I am working with two videos that I captured using the same work flow on the same day. One project exhibits the tint while the second project does not. If I import the problematic footage into the good project the tint problem follows the footage. In the good footage, the cross dissolve produces a result that does not have a green tint. If I re-capture the "bad" footage the results are the same.
Has anyone else experienced this and does anyone have an idea how to resolve this problem?
Thank you.
Dual G5 Mac OS X (10.4.6)

In my project, both clips are source clips with Chroma, Color Smoothing and Matte Choker applied. A dissolve from non-chroma clip to chroma clip works fine. Only problem is with two chroma clips. In my dissolve, the error appears as red fringing in the area between the two masks.< </div>
You're using creative shorthand that doesn't help. "Chroma clip" means the clip to which you have applied all of these effects? What masks? Where are you getting the masks?
To understand what's going on with all them itty bitty pixels in a stack of interactive effects, do me a favor: render out a short piece, say 10 seconds of each of your chromaclips as separate movies over transparency using the Animation codec. Reimport them and put them over a solid colored Dissolve between them using different types of dissolves. Post back and tell us (me) what's going on.
I still consider this to be a bug -- nesting adds more steps to the workflow than if this bug did not exist. < </div>
It's not a bug. Your pixels are running down a pathway. It's a question of building the correct pathway and having the correct pixel wranglers with the right kinds of cattle prods.
bogiesan

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