Javascript not loading with admin_print_scripts

As far as I can tell it was the upgrade to 2.8 that caused my script to stop loading. Is there any new update that would prevent the following from working? Is there a new and/or improved way of doing this?

add_action('admin_print_scripts', 'vizzer_js_init');

function vizzer_js_init()
{
	wp_enqueue_script('vizzer', '/' . PLUGINDIR . '/vizzer/js/vizzer.js', array('jquery','jquery-ui-sortable', 'json2'));
}