CUPS Zebra EPL2 driver through Iceweasel or Evince

[Mark Copper <mlcopper@gmail.com>]

Dear List,

What might explain this behavior?  A Zebra label printer (GX430t) is
configured through CUPS and it is desired to print a PDF file on it.
The PDF file was created with the Perl module PDF::API2.

The file prints fine from the command line:
   $lpr -P Zebra_Technologies_ZTC_GX430t file.pdf
and it prints fine from within gv.

But it does not print from within Evince or, more importantly for our
purposes, from the embedded Iceweasel pdf viewer.   CUPS logs include
the error messages:
   (/usr/lib/cups/filter/rastertolabel) stopped with status 1.
and
   Job stopped due to filter errors; please consult the error_log file
for details.

It's probability 0 that someone else has had this exact problem.  But
I'm wondering if anyone might have some ideas on an approach.  Maybe
something can be changed in the PDF generation?  Maybe something can
be changed in the Iceweasel settings?

Thanks for your time.

Mark