The re-detection of the printer and creation of a new queue can be caused by the problems of the printer discovery of the new libusb-based USB backend of CUPS (bug #420015). The fact that your old queue stopped working can be caused by bug #420797.
Please do a full system update, then delete the second queue and re-plug your printer. Now no new print queue should appear.
The re-detection of the printer and creation of a new queue can be caused by the problems of the printer discovery of the new libusb-based USB backend of CUPS (bug #420015). The fact that your old queue stopped working can be caused by bug #420797.
Please do a full system update, then delete the second queue and re-plug your printer. Now no new print queue should appear.