Joomla! 1.5.22-1.5.23 FIX for AdminExile

/** You just have to go to file /libraries/joomla/session/session.php and find */

function fork()
    {
        if( $this->_state !== 'active' ) {
            // @TODO :: generated error here
            return false;
        }

        session_regenerate_id();
        return true;
    }

/** Replace it with */

function fork()
    {
        if( $this->_state !== 'active' ) {
            // @TODO :: generated error here
            return false;
        }
        // get the old data
        $sessiondata = $this->_store->read($this->getId());
        // delete upon regenerate (true)
        session_regenerate_id(true);
        // write the old data to the new session
        $this->_store->write($this->getId(), $sessiondata);
        return true;
    }

/** You've done it! */