Images not showing in PDFs

Hi,

I have Vista Ultimate and Office 2007 trial. I have made some editing
changes to Word docs created in Office 2003 and want to use "Save As PDF."

The PDF is created, but the Images don't show.

I tried this two ways: with the doc in its original .doc form and also saved
as .docx before running Save As PDF.

Then I tried creating a new Office 2007 word doc and inserting a couple of
the same images. This time, after Save As PDF, I can see the images fine.

I then went back into a copy of the Word 2003 doc and selected a couple of
the images and then chose "Bring to Front" (in case they were somehow behind
the text). No joy.

Note that I was able to create PDFs with the full version of Adobe Acrobat
back in 2005 with these doc files.

I'm baffled. Suggestions, anyone?

Thanks!

P.S. I also tried BullZipPDF and got the same result ... no images in the PDF.