Hello Gary
I'm not sure what you mean by '…build from a 4 page…', can you elaborate?
It might be worth asking your customer to try PDF-X. To do this she needs to use the PDF button in her print dialog box and select Save As PDF-X ...
I'm certainly no expert in this area but I understand that PDF-X is an ISO defined subset of the PDF standard specifically designed to eliminate compatibility issues. (see
http://en.wikipedia.org/wiki/PDF-X). I've also read that some people have had success using this to overcome compatibility issues on pdfs with the online publisher Lulu (although I've not seen much confirmation of the latter).
Good luck
Ian