What causes banding in Color Gradients?

Using CS6, I created a sky gradient on a new layer, then imported some photos to other layers for a composite. Then I noticed horizontal banding of varying widths in the sky area of the gradient. When I use the Move Tool to move the gradient layer around, the bands move along in a fixed position, so it's not my monitor. When I Option-click on the gradient layer eyeball icon to make just that layer visible, there is no banding on the screen, just a smooth gradient as it should be.
I have never noticed this happening before. What causes it and what can I do about it? Thanks.

Are you absolutely sure it isn't a display issue? I tried to produce banding after an earlier reply, so as to see just what difference I'd see at different bit depths. I change just one channel by one number from foreground to background, and ran gradients right across my 30 inch Dell Ultrasharp, and couldn't see any problems at any bit depth. I didn't try saving out to JPG and reloading, or reducing the file to Indexed colour to lower bit depth still further, but I was reasonably sure that I would see a problem after doing so.

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[merge1.jpg]
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[merge2.jpg]
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[merge4.jpg]
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[merge5.jpg]
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g

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