More information, please. Version of ID and OS? What printer?
Is this shadow around the page border, or on objects inside the page? are you printing scaled, or at 100%, or some type of multiple pages per sheet?
Thanks for responding Peter. I have latest update of ID for CS6 (I believe it's 8.01) on Windows 7. My document is A5 at 100% but am printing two pages per A4 sheet (paper). The shadows are on page borders only - offset left/below all left pages and right/below all right pages (it's a book manuscript).
Sounds to me like you are printing thumbnails, and the sahdow is a "feature" of thumbnails that you cannot turn off as far as I know.
Why not check the Spreads box instead and print on the A4 sheet? That would give you a true reader's spreads view -- page 1 will be by itself and other sopreads will have even pages left, odd pages right.
Indeed, 'thumbnails' was enabled in the printing options so the shadow went away when turned off ...though the 'thumbnails' option was located in separate area to 'spreads' vs 'pages' options. Thanks for your help Peter