Create a new style with no parent - Styles & Templates > Style Manager > Add New Style > no parent - then browse the site using that totally default vbulletin style - do you still have the same problem?
Problem solved but now i have another problem .........Registered members cannot post on the forum this is the notice they are getting when they try to post "Your submission could not be processed because a security token was missing."
If this occurred unexpectedly, please inform the administrator and describe the action you performed before you received this error.