This could be related to how the pdfs are created or it can be related to problems with Microsoft's printer drivers. Do you have a problem pdf for us to look at?
Thanks for the response Michael,
Here is a file I converted from Word to a PDF that will only print the graphics.
I am using Word 2007 and Adobe Reader 9 Pro. I have the CS4 suite. When I save, I am using the following parameters:
Convert Document Information
Enable Accessibility and Reflow with tagged Adobe PDF
Convert Word Headings to Bookmarks
I should add that changing and eliminating these parameters make no difference.