Hello,
I using the latest version of your plugin 2.0.57 and when users with the role of 'editor' login they see this error on every page of the backend:
Notice: Undefined index: nextgen-gallery in /var/www/vhosts/example.com/httpdocs/wp-content/plugins/nextgen-gallery/products/photocrati_nextgen/modules/nextgen_admin/class.page_manager.php on line 144