Your Photopost is set fine.
I would suggest you recheck your classifieds. Make sure in the config-inc.php file your proper vbulletin license number is entered.
Use phpmyadmin check your classifieds settings tables make sure setting 41 says vb3. Make sure the cookie settings settings 181-183 are this
cookie path /
cookie prefix bb
cookie domain .stuntfactoryx.com
Everything I see leads me to beleive one of the above is incorrect. Specifically I think your not integrating with vb3 on setting 41 or your license number is incorrect since the user login does not authenticate if I try logging in from here. Thats a tell tale sign your license number,integration type or cookie prefix have not been entered correctly since the vbulletin password is encoded with the prefix and license number and it will not match.
http://www.stuntfactoryx.com/classif...ogin&login=yes