Comment 8 for bug 1284395

It seems that if you turn on a feature with the cupsctl command or a GUI and turn it off again, that cupsd.conf does not return to its original state again but only to a state whichg fulfills the configuration change request. You could try to report an upstream bug on http://www.cups.org/str.php, but I do not know whether it will get fixed, as the change in cupsd.conf only affects the Debian package system, not the functionality of CUPS.

Note that the printer sharing settings did not move to the new cups-files.conf.