CS2 Sharpening Problems...

When I view my image at 100% and use Unsharp Mask I set my parameters but when I click ok CS2 does not sharpen to the degree I set. I can see the image change from my preview of the anticipated sharpening to something less. Anybody else having this happen?

What do you see in the print?
Why don't you use Smart Sharpen?

Is this a problem with a specific file?