daffox

Here is full functions code:

function shortcode( $atts ) {

        extract( shortcode_atts( array('post_type' => 'post'), $atts ) );

        ob_start();

        if ( is_user_logged_in() ) {
            $this->post_form( $post_type );
        } else {
            printf( __( "This page is restricted. Please %s to view this page.", 'wpuf' ), wp_loginout( get_permalink(), false ) );
        }

        $content = ob_get_contents();
        ob_end_clean();

        return $content;
    }

mb conflict is with ob_start();?