Are you logging into vbulletin and not being logged into vbulletin? I am a little confused by your responses. I cant tell whether its one or both apps. If its both apps then there is an issue with
vb and cookies since essentially it is
vb creating the cookies.
To test the login with photopost what happens if you try and login here.
http://freeadsasia.com/photopost/mis...ogin&login=yes
Your cookies in both apps need to be this
cookie_path = /
cookieprefix = bb
cookie_domain = .freeadsasia.com