Ghostscript, postscript, fonts, HELP!

[Marcel Gagne]

Hello everyone,

I've got a client who generates raw postscript files so they can be printed on 
a large-scale printing press to generate camera ready art, etc.  Not really my 
strength, but due to a very very old machine needing to be replaced, we also 
wound up upgrading the OS, which brought a whole new ghostscript, groff, etc, 
with it. Now he tries to generate ps files and they seem fine, but trying to 
get ghostscript to do anything with them is a nightmare. For instance, if we 
try to do a pstopdf on a file that displays just fine in gv (albeit with 
errors), we get the following.

Error: /undefined in Cg
Operand stack:
   0
Execution stack:
   %interp_exit   .runexec2   --nostringval--   --nostringval--   
--nostringval--   2   %stopped_push   --nostringval--   --nostringval--   
--nostringval--   false   1   %stopped_push   1878   1   3   %oparray_pop   
1877   1   3   %oparray_pop   1861   1   3   %oparray_pop   1755   1   3   
%oparray_pop   --nostringval--   %errorexec_pop   .runexec2   --nostringval--   
--nostringval--   --nostringval--   2   %stopped_push   --nostringval--
Dictionary stack:
   --dict:1157/1684(ro)(G)--   --dict:0/20(G)--   --dict:71/200(L)--   
--dict:58/120(L)--
Current allocation mode is local
Last OS error: 2
Current file position is 97586
GPL Ghostscript 8.71: Unrecoverable error, exit code 1

I'm at a loss to know where to look, so I need some help. If you are a 
ghostscript, font, groff, etc, guru, this is your time to shine. My customer 
will even pay for your time! 

Help me ghostscriptwankenobi, you're my only hope.

-- 
Marcel (Writer and Free Thinker at Large) Gagné
Note: This massagee wos nat speel or gramer-checkered.