Problems after upgrade to CUPS 1.7.1 - gstoraster error

[Dr. Peter Voigt]

After one of the latest ports tree updates on 10.0-RELEASE I upgraded
CUPS to version 1.7.1. This version of CUPS reveals some strange
behavior, although printing itself seems to work as expected.

After the printer has finished a job the job is still being marked as
active. The CUPS web interface has marked the job as 'stopped 
"Filter failed"' and the CUPS version of "lpq" still lists the job as
being queued.

The cups log file is directed on my system to rsyslogd and shows
following error messages:

- Job stopped due to filter errors; please consult the error_log file
  for details.
- /usr/local/libexec/cups/filter/gstoraster) stopped with status 1.

Fortunately these errors do not block the printing system, e.g. I can
start further print jobs which will be printed immediately. However it
is annoying that the printing queue gets filled more and more.

Here are my installed CUPS related packages:

# pkg version -v |grep cups
cups-1.7.1                         =   up-to-date with port
cups-base-1.7.1                    =   up-to-date with port
cups-client-1.7.1                  =   up-to-date with port
cups-filters-1.0.42                =   up-to-date with port
cups-image-1.7.1                   =   up-to-date with port
cups-pstoraster-8.15.4_7           =   up-to-date with port
gutenprint-cups-5.2.8_1            =   up-to-date with port

Any advice is appreciated.

Regards,
Peter