Trejder - 2017-01-30

It is hard to belive it (?), but after rising this ticket everything is now OK.

Then only thing I can think about (except ghosts or the fact that I'm going mad) is that this single run of NAPS2 3.0 Standalone cleaned some settings that are shared with NAPS 5.3.3. Is this possible at all?

I have also found an option "Flip duplexed pages". Going to test it along with your suggestions, once this weird case returns. But, for now -- this ticket can be closed.