After upgrading our machines to 10.1.2 I see that duplex printing is enabled by default. This caused some confusion in our office. Here are 2 ways to fix this:
When printing, uncheck "print on both sides"
If you want to use an automated tool (for corporate roll out) change/create this registry key:
1 = no duplex
0 (or key does not exist) = duplex
Hopefully this helps someone else.
Message was edited by: joelb_mfab Corrected key name to iDuplexMode (originally I incorrectly posted iprintBookletDuplexMode)
Thanks for the post.