Bug in Acrobat Reader 8 & 9? "Actual size" not actual size

When I choose to view a PDF in "actual size" using Adobe Acrobat Reader 8 or 9, it is NOT actual size. Under Acrobat Reader 7, it WAS actual size.
For example, if I go to the properties of the document and find out that it is supposed to be an 8.5 x 11 document, the document on screen is not 8.5 x 11.
This used to work under Acrobat 7, but doesn't work under Acrobat 8 or 9. It used to be that you could hold an 8.5 x 11 piece of paper up to your monitor and the size of the image on screen was exactly 8.5 x 11, but now if I do the same thing, the size on the monitor does not match the actual size of the paper.
Is this a bug or something else?

The screen size is 17" and the current resolution is 1024 x 1280 (it is in "portrait" mode), but it happens at every resolution I've tested.

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