I cannot print duplex because 2-sided option is grayed out in printing preferences dialog
When I try to print any website using either CTRL-P or clicking the Print button on the preview page, the output is always single-sided. If I try to override by selecting 2-sided mode from the Printing Properties dialog, I cannot because the option is grayed out. This does not happen in other programs such as Microsoft Word, where the same 2-sided option works. My printer is a Brother MFC-J995DW.