As the Printers pane was still empty, I went ahead to add the simplest of my printers (LaserWriter 360 connected via AppleTalk) which has always been successfully added to the Printers List in the past. No luck! Waited a few minutes while is was "Searching for new drivers.". I tried the Color Laserjet 2605dn. No luck. Then the Laserjet P1606dn. No luck.