note 13981 added to language.variables.scope.php

sandhawk@spies.com: This shouldn't be a problem if the URL you are trying to access is the same as the URL that you started the session from. Starting a session [commonly] stores a cookie on the user's computer from the URI they are currently on. If you then try to link to a different URI you can't use the same session, as different URIs are not allowed to access each other's cookies (for obvious security reasons). http://www.php.net/manual/en/language.variables.scope.php