So I recently got an HP Laserjet with built-in duplexing. Works great, and I'm very happy with it. The problem is, every time I go to print, the printer's settings have reverted to disabling duplex. So, every time, I have to go back into my preferences and turn it back on. It's very annoying. It's doing the exact same thing on two different Macs: a Mini running Mavericks, and a MacBook Pro running Mountain Lion. Has anyone had a similar issue, and/or any ideas on how to fix it? I haven't found any other solutions anywhere so far.