Alan,
I was unable to reach you by email ...invalid address.
I am experiencing a two-sided problem with HP7410 and Vista.
While two-sided printing occurs, it does not preserve the original layout.
Instead, the even pages are printed upside down no matter how options are
selected in the preferences dialog boxes.
My 7410 is Ethernet connected to my router to serve as network printer.
Everything works well with XP. Problem only with Vista.
Discussed this HP representatives (via their chat) and no success thus far.
They instructed me to download and try drivers from other HP printers, but
got same result.
What do you suggest?