Sorry - forgot to add:
This guy is using Filemaker 10. Some of us are on 11, but this problem started before we began to upgrade.
We are all on XP
We access the DB through a server running Windows Server 2003.
I am NOT an IT guy. I am the company's Filemaker guru/developer having had 2 days training about 3 years ago.
Is he attempting to open the PDF on a smart phone or from a computer?
(There have been issues with smartphones and Filemaker PDF's if I remember correctly.)