Reply To: 2 sided printing

Just a stab in the dark, but is the printer itself set to print two-sided? Not your InDesign settings, but the printer itself?

I only ask because a few years ago at work we had trouble printing double-sided and we had to access the printer via the the IP address and log into it and enable double-sided printing.

We also had to go that route as well at one time because an update (either MacOS, Adobe, or printer) suddenly caused all files to print double-sided when we wanted on-sided. We had to log into the printer via IP address and make the default single, but allow double when selected in InDesign.