Comment 9 for bug 959195

htorque just pointed out to me on irc that CUPS may have multiple subscriptions.conf.

Updated instructions (notice the star at the end of line 2):

  sudo stop cups
  sudo rm /etc/cups/subscriptions.conf*
  sudo rm -r /var/cache/cups
  sudo start cups

This will only get rid of the processes that are currently running. You need the updated package (see comment #5) to make sure no new ones are created.