Having had no problems in printing two sided, nowI can't print two-sided any more in Adobe Acrobat Pro for Mac ver 11. 0. 10.
In the Mac print dialog box, the two-sided option has been ticked but, in the"Show Presets" dialog box, the setting - Copies and Pages - Two-Sided value always shows off. Whatever I do, I cannot get the two-sided value to show on.