Problem saving Quark Xpress 6 file back to Quark Xpress 5

We are having a problem saving Quark Xpress 6 files back to Quark Xpress version 5. To send a file to a printer we had to resave it as Quark Xpress 5 so that they could work with it, the printer is still using QuarkXPress 5 on Mac OS 9. I created the file on QuarkXPress 6 on OS X 10.3. When do a "save as" to make it a version 5 document, it seems to lose many images and some image boxes. The folks at the printing company said others had been unable to save a file as a version 5 quark document without losing images and some links. Any ideas how to fix this, it doesn't seem to happen with every document and is therefore even more scary?
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PDF-X-Robot will eat your Quark & InDesign books for breakfast!

I am very curious about PDF/X Robot. From what I've read on your web site it would greatly improve efficiency and productivity of our PDF workflow.

Background: We produce perfect bound Japanese graphic novels that we convert to English. The book page count ranges from 150 to 300 black and white and color pages. We use Quark XPress 4.11 but will be switching to InDesign CS in the future. Most of our computers have Mac OS X 10.2 but will eventually upgrade to 10.3.

Questions: Does PDF/X Robot work with book production? I read on your website that it is designed for magazines and catalogs?
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