page inversion in duplex

I have a six page PS document which I need to print double-sided. For
portability, I want to convert this PS to PDF. If I print the PS in
GSview, every thing is fine. If I use GSView to convert to PDF and
print the PDF (whether with GSview or Adobe), some pages are inverted.
Depending on which "flip page..." duplex option I choose, either the
front of the first sheet is upside-down (inverted) compared to all of
the rest, or the entire first sheet is fine and the front of the
remaining sheets is upside-down (inverted) compared to the back of
those sheets. I am using GSview 4.3 and Ghostscript 7.03. This is
independent of whether the "safer" option is on or off. Is this a bug?
Or, am I misusing something? This is my first experience with these
products.