I am trying to setup a 4050 with a duplexer on an NT network with either the 5e or 6 driver. However, I cannot get the duplex option to stick. I turn on the duplex, press OK, then look at the properties and the box is unchecked. I don't want to turn on the duplexing on the printer control panel as we need to do single side printing also. Any ideas? Thanks for any assistance.