auction site phpprobid facebook twitter access modification php

I am looking for a talented PHP coder who has experience in facebook/twitter intergration with a understanding of PHPPROBID modified by (y.s.p) I had the auction site working on a different domain but have since changed this over with a new domain name. I have made changes to the facebook and twitter intergration and both work when it comes to pulling data across, such as email address, first name, last name. When a user inputs inere facebook details into the auction site, it asks for access to facebook api, once accepted the details are pushed through to the auction site, this also applies with twitter too. The user will need to complete other empty fields on auction site where, such as country and pin number. This forwards a verfication email to email address, once user clicks on this, the account is setup. When the user clicks on facebook or twitter now, enters in there username/password the user will have access to the auction site main account, they are logged in. The problem. When user goes to sell an item for example, clicks the "sell" tab it shows this message -> NOTE: Only sellers are allowed to view this page. so this would seem like an access level problem, same applies if they want to place a bid on item for sale from another user, this goes back to main menu and doesnt allow access it would seem. The rest of the site works fine, the accounts are created and can be viewed sucessfully with the admin panel I am looking for someone who can fix this please, I am on a budget and I have lots of excellent feedback so please ONLY bid on this if you have experience. IE - PHP experience, PHPPROBID (Y.S.P version - this is just a modified version with lots of mods) and ideally some experience with facebook/twitter intergration. Please ask for site name, due to facebook security I will only allow access to winner as this is my private accounts, would be recommended if you have your own facebook account / twitter account to login and see the error yourself. Thanks for looking and please only genuine bidders only, no timewasters, please see my feedback for piece of mind.