admin_enqueue_scripts function runs, does not output scripts!

I’m developing a theme which includes a widget that allows you to upload & select images using the Media Library.I need to load custom scripts on the widgets admin page in order to do this. In my functions.php file ion the theme root directory, I have the following code:

function widgets_admin_scripts()
{
	wp_enqueue_script('jquery');
	wp_enqueue_script('media-upload');
	wp_enqueue_script('thickbox');
	wp_register_script('media-upload', get_stylesheet_directory() . '/js/media-uploader.js' , array('jquery','media-upload','thickbox'));
	wp_enqueue_script('media-upload');
	wp_enqueue_style('thickbox');
}

function load_admin_styles()
{
	wp_enqueue_style('thickbox');
}

//add_action( 'admin_print_scripts', 'widgets_admin_scripts' );
//add_action('admin_init', 'widgets_admin_scripts');
//add_action('init', 'widgets_admin_scripts');
//add_action('admin_print_styles', 'load_admin_styles');
//add_action('admin_print_scripts-widgets.php', 'widgets_admin_scripts');
//add_action('admin_print_styles-widgets.php', 'load_admin_styles');
add_action('admin_enqueue_scripts', 'widgets_admin_scripts');

I got this code from a plugin that can be found here.

My problem is that NONE of the wp_enqueue_script calls inside the function are loading ANY scripts in the head. The wp_enqueue_style works perfectly fine.

widgets_admin_scripts() is definitely being called, but none of the wp_enqueue_script inside of it are actually outputting scripts. I know its being called because I threw an echo in there and it appeared on the page.

I’m totally baffled – I changed the code in the plugin reflecting the same code that I posted here, and it works perfectly fine as long as its in the plugin. admin_enqueue_scripts refuses to enqueue scripts when its called from the functions.php theme file.

And it’s not just admin_enqueue_scripts; admin_print_scripts doesn’t work either, nor admin_init, init – NONE of them will enqueue & output scripts, all of them will enqueue & output styles with no problem though from functions.php.

Tried uninstalling all other plugins, deactivating/reactivating theme, nada. Any ideas, my fellow wordpressers?