Use the code below to activate the bugging in WordPress but locked down to your IP.
Put this in the wp-config.php replacing define('WP_DEBUG', false);.
This allows you to see debugging but everyone else without debugging.
if($_SERVER['REMOTE_ADDR'] == "999.999.999.999") {
define('WP_DEBUG', true);
} else {
define('WP_DEBUG', false);
}