As Michael said work in progress.
I posted the above code in that thread for Bryan Ex as he and I have been working on tracking this down for a while. Photopost does not use sessions. We use Cookies. I was finally able to on an install that I did for a new customer able to duplicate the problem since cookies were not setting for this site. I found that
VB reads the user as logged in from the session cookie and the session cookie caused a half logged in situation. I was able to do a mini test on that install using the code above. We may go about killing or blocking the session in a whole different way we shall see. This is in the very early stages.