I can't print duplex on my brother hl2170w wireless printer! It is networked, and the two sided option is greyed out. I know this printer is duplex, because it says so on brother's site and on the box. Could it be because I chose to not install printer drivers when I was installing Leopard? I unchecked that option, to not install any printer drivers. Could that be my problem? Please hurry because my report is due tomorrow! EDIT: It is NOT automatic duplex, but rather manual duplex. How would I print duplex manually? I know it has that function. I don't want to print odd pages and then flip them around to print even. First, because it is a compact laser and I have no idea how to position the paper. It is monochrome, but it's just a rough draft, so no need for color. It has a slot to feed the paper in for manual duplex.