If you move up to a previous state in the History, you lose any steps done after that one. Clicking on Open at the top of the History palette will revert to the original state of that document. You would have to start over. You could just click on the last History step you did before the one you want to change. Since you are using CS4 you can use Smart filters. That allows you to apply filters to a layer and then have the flexibilty to change the settings anytime.
I recommend that if you are going to manipulate a photo layer on a layout, you work with a duplicate of the layer and turn off the visibility of the original.
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Cassie
My Gear: Nikon D80 w/18-200mm VR & 50mm 1.4
Software: Adobe Photoshop CS4, PSE 6, Lightroom 2
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