Question about Red Render bars

I added a letterboxed effect to one of my clips but then decided to remove the letterbox. However, I still have the red render bars up there. Why do I need to render my already completed project over again? Well not the whole project but at least that clip. I have noticed this a lot when I add things to a timeline then remove them but the render bars stay.
 
Re: Question about Red Render bars

Video files are big.

FCP isn't always as smart as it can be about preserving previous renders, but in general making changes to a clip will mean re-rendering. With each "level of undo" potentially taking up GBs of hard-drive space, there isn't really any other way.

(Except buy a fast G5 so you never have to render, like in Apple's demos?)
 
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