Found it.After the upgrade both /etc/cups/cupsd.conf and /etc/cups/cups.d/ports.conf contain the line
Port 631
It is assumed that each appearance of this line causes the daemon to attempt to
grab the port, the second resulting in failure.
Removing either one restores operation. all the best Mark -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]

