I am currently using the iThemes security plugin along with the SEO plugin.
1 of the suggestions that the ithemes security plugin suggests is changing the wp-content folders name.
Unfortunately your plugin is currently causing an issue for this. Instead of using the wordpress config to ascertain the name of the wp-content folder you are hard coding this (located in all_in_one_seo_pack.php)
if ( ! defined( 'WP_CONTENT_URL' ) )
define( 'WP_CONTENT_URL', site_url() . '/wp-content' );
if ( ! defined( 'WP_CONTENT_DIR' ) )
define( 'WP_CONTENT_DIR', ABSPATH . 'wp-content' );
It would be ideal for this to change so that you are not using hard coded folder names.
As I am using the ithemes security plugin with 404 protection on it is causing me to be banned from my blog periodically.