FCP Chroma Key requires re-render after any changes

FCP: version 602A89
In an HD 1080i60 sequence - there is a clip - the Chroma Key video filter has been applied to a pretty-well-lit 'stinger-green' backdrop. By making adjustments anywhere in the Chroma Key filter visual dialog, the entire green-field returns and cannot be eliminated except by re-rendering the clip.
See EXAMPLE IMAGES at http://www.glorioski.com/fcp/chromakey.html
I guess this could be submitted as a bug - but I am thinking there MUST be something I am not doing or have inadvertently set (or unset).
Any ideas?
Thanks! Lance Drake

Hi Jerry,
Hey thanks for your response to this question - but, I do not believe that this has always been the behavior with regards what has been presented in the canvas - at least for the current frame.
It's quite reasonable that re-rendering will be needed to apply the changes to the entire clip. However, my point is that, as adjustments in the Chroma Key filter are made - the results of the previous setting of the filter are completely abandoned and the single frame displayed in the canvas reverts to the case as if the filter had never been applied.
The BIG drawback to this behavior is that you cannot see how slight changes in filter settings affect what will be the result were you to go to the trouble of re-rendering the entire clip. Having to re-render with every adjustment sticks you in a huge time-hole.
I wish I had a system with FCP 5 on it - it would be interesting to see how FCP used to behave. Am I nutzo? Somehow I don't think so. It's my recollection that it was possible to make changes to the ChromaKey filter - see the effect of those changes rendered into the single frame of the canvas - and then it was up to you to cause the rest of the clip to be re-rendered.
Unless somebody kicks in with specifics regarding the error of my ways, I am thinking this should be submitted to bugreporter.

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