I can not answer your vb
question that you might want to ask at vbulletin.
Now let me see if I understand what your trying to post. You can or can not get into admin.
As far as Photopost is concerned with vbulletin your cookies need to be exact as I posted above and match to vbulletin.
One more thing. Have you entered the correct vbulletin license number on the initial config when installing? you can edit your photopost config-inc.php file and make sure you have entered on the $vblicense line your license number for vb
. This is important as thats used for the password cookie creation and authentication.