Version: 0.9.1 (using KDE 4.3.2) OS: Linux Installed from: Debian testing/unstable Packages Since an upgrade of KDE (Debian testing) Okular always submits jobs to be printed in duplex, even jobs consisting only of one page. This behavior must originate from okular, as "old" kpdf or printing from command line (cupsdoprint) produce the expected, non-duplex output.
I am closing this bug since i can not reproduce the problem in the Okular version that will be released with KDE Applications 4.9 release If you upgrade to that version or a later one and you still have this problem please reopen the bug Thanks for caring about Okular :-)