I have the latest Acrobat X on my MAC, but the print option for "print on both sides" does not show up. It shows up fine in other applications, just Acrobat doesn't include it in the print dialogue box.Of course, the printer allows for double-sided printing, and I use it all the time. And there is only one printed installed on the computer.
I look through the "Preferences," but couldn't find anything governing printing.
Any idea what it could be?