I have played around with this for some time now, and simply can't get into my admin section of photopost.
I am running postnuke, as seen here: http://www.jeepz.com
and a fresh install of photopost here: http://www.jeepz.com/gallery
I can login to either successfully, but when logged into photopost, I am a normal user (indeed, I have never even seen the photopost admin screen).
These are the settings from my photopost database
Content visible to verified customers only.
I use pnphpBB2 as my forum (based on the phpbb2 board, and the cookies seem to match there