Your cookies are not set right. Most likely the new header-inc is using VB
cookie settings so yes on the front end your logged in but when you installed Photopost you did not set cookies right. hense when you drop using vb3 integration as in admin your cookies dont match since the cookie settings are got from the photopost database
You most likely do not have your cookie prefix set to bb
you would need to view your settings table via phpmyadmin and look at lines 171-173 and make sure cookie settings are correct. There are plenty of threads here on this issue.