affiliates_permanent_my_users

function my_affiliates_permanent_my_users( $atts ){
	$output = "";
	if ( is_user_logged_in() ) {
		$user = wp_get_current_user();

		$args = array(
				'meta_key'     => Affiliates_Permanent::REFERRER,
				'meta_value'   => $user->ID
		);
		$users = get_users( $args );

		if ( isset( $users ) && ( sizeof( $users ) > 0 ) ) {
			$output .= '<ul>';
			foreach ( $users as $us ) {
				$output .= '<li>' . $us->user_login . '</li>';
			}
			$output .= '</ul>';
		}
	}

	return $output;
}
add_shortcode( 'affiliates_permanent_my_users', 'my_affiliates_permanent_my_users' );

That's great, I'm glad you resolved this and added further features.
Good to know that my code is useful.

Cheers