I just posted this note... if I disregard the error that that note talks about and I try to log into my gallery, I'm getting a "This page cannot be found" error. (which makes sense since I don't see a login.php file in my Photopost folder - and there's not one in my original extract file local on my machine either...)
I've nosed around quite a bit looking for an answer to this, so I have checked my cookie settings (path = /, prefix = bb, cookie domain = blank...but I get the same results even if I enter in the site URL)