Load plugin translation in new WP version

Hi,

I have several plugins that are translation ready. All translations are stored in my plugin folder /languages. The translation is loaded via this function:

function vscf_init() {
	load_plugin_textdomain( 'verysimple', false, dirname( plugin_basename( __FILE__ ) ) . '/translation' );
}
add_action('plugins_loaded', 'vscf_init');

Several users of most recent WP version are saying the translation does not work.

I notice in most recent version you can set language in WP dashboard in stead of defining it in wp-config file:

define('WPLANG', 'nl_NL');

Question, should I load my translation files differently?

Guido