I also had this problem after recent upgrade with a D2660. The fix is:
chmod 755 /usr/lib/cups/backend/ /usr/lib/cups/backend/* -- Mark Hedges PGP key: http://www.scriptdolphin.com/MarkHedges.asc -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org