This plugin fix an issue with medias and content restriction on "Members" plugin WordPress (http://wordpress.org/plugins/members/). Allow to save correctly metabox data also for "attachment" post type.

members-fix-attachment.php

<?php
/*
 Plugin Name: Members - Fix for attachment
 Plugin URI: http://www.beapi.fr
 Description: This plugin fix an issue with medias and content restriction on "Members" plugin WordPress (http://wordpress.org/plugins/members/). Allow to save correctly metabox data also for "attachment" post type.
 Author: BeAPI
 Author URI: http://www.beapi.fr
 Version: 0.1

 ----
 Copyright 2012 Amaury Balmer (amaury@beapi.fr)
 ----
*/

add_action( 'add_attachment', 'members_content_permissions_save_meta_media', 10, 1 );
add_action( 'edit_attachment', 'members_content_permissions_save_meta_media', 10, 1 );

function members_content_permissions_save_meta_media( $post_id ) {
  if ( !function_exists( 'members_content_permissions_save_meta' ) ) {
		return false;
	}

	$post = get_post( $post_id );
	members_content_permissions_save_meta( $post_id, $post );
}