You do not have your cookies set right or the license number
Photopost cookie settings should be this
cookie path /
cookie prefix bb
cookie domain .domain.com
Your
vb license number is at the top of every
vb file and must be entered exactly in the config-inc.php file of photopost in the $vblicense variable.
Most common mistake on
vb installs is customer does not input the proper prefix or incorrect
vb license number and these are crutial. The
vb password cookie is a encrypted hash of these two variables and the user password and the user will not authenticate without this.