A problem with a lot of the low-end PDF engines is that they do not work
well from a Windows service. MCPPRT can be installed as both a user
program and as a service, so if yours is a service, that may be the problem.
I have a UNITE talk from 2012 that gives a detailed script for setting
up Enterprise Output Manager (EOM), and includes instructions for
configuring both email and PDF output. It describes using Win2PDF, but
should work with the Amyuni PDF Writer software as well.
http://www.digm.com/UNITE/2012/
Note that EOM releases for the past several years have the Amyuni PDF
Writer bundled with the license, but the PDF software is not included in
the release by default. It's a no-cost item, but you need to order it
separately.
--
Paul