I have Windows 7 and just bought a duplex unit for our HP 4250. I have turned it on in all the areas of the print configuration and it does detect ir because I ran a configuration page and it is listed under Paper trays and options as Duplex unit. However, when I try to send a print job to it, it only gives me the option of print on both sides manually. See attached. If anyone can help me I would be greatly appreciative!!
Thanks!
Kim