Comment 23 for bug 600764

Looking at /etc/cups/printers.conf, the only obvious difference between the print PDF created by the stock maverick cups-pdf-2.5.0 package, which prints blank pages after upgrading to your cups-pdf-2.5.1 package, and one created manually after the upgrade, are the Filter lines.

In the original one created by cups-pdf-2.5.0:

Filter application/vnd.cups-raw 0 -
Filter application/vnd.cups-pdf 0 -
Filter application/vnd.cups-postscript 100 -
Filter application/vnd.cups-command 0 commandtops

The one manually created after upgrading to cups-pdf-2.5.1:

Filter application/vnd.cups-raw 0 -
Filter application/vnd.cups-command 0 commandtops
Filter application/vnd.cups-postscript 0 -

The "application/vnd.cups-pdf" line is not present when the printer is created manually after the upgrade.

The PPD file is also different. The original:

root@sides-laptop:cups# ls -l ppd
total 612
-rw-r--r-- 1 root root 21061 2011-04-21 09:07 PDF.ppd

The newly created one:

root@sides-laptop:cups# ls -l ppd
total 612
-rw-r--r-- 1 root root 20956 2011-04-21 09:14 PDF.ppd

I'm also seeing very inconsistent behavior with regard to removing the PDF printer when the cups-pdf packages (both the stock one and your 2.5.1 package) are purged. Sometimes the PDF printer is removed, sometimes it isn't.