🚀 go-pugleaf

Norbert,

FWIW, the PDF import filter converts the format internally to an EPS
representation, before it gets output to the print stream. EPS files
usually are passed straight through by the GDI. So effectively, the
PDF is then out of the loop. 

For FM to be outputting anything in DIB (image format) for an EPS
source, it could be thinking that the output device is non-postscript
and just sending the preview image. However, why is this changing
during the course of the job - either something in the PDF to EPS
conversion or what the printer driver is telling FM/GDI what it is?

The fact that it is non-reproducible and you're using a non-standard
configuration (custom postscript printer instance) will be a bear to
pin down.

How many PDFs per document/book are involved? How many files in the
books being generated? How many pages are being generated at a time
when this error occurs? How big are the postscript files? I'm trying
to get a feel if there might be some resource issues involved.