This has something to do with the image format although I am unsure exactly what formats will allow nudging of individual channels. As I edited my PSD image, I tried flattening the image, but Photoshop would not allow me to nudge channels. I know I had previously done this within the same version of PS (CS5) so I output my image as a JPEG with 100% quality (to avoid image degradation) then opened the JPEG in Photoshop. Photoshop then allowed my to nudge individual channels without complaint.
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