doxrealm

That happens because most of this plugin is a copy of ,
IMAGE GALLERY RELOADED.
Author says its a fork but if you make a diff …

So when you click Plugins-> Responsive Media Gallery-> Settings , it takes you to this url:

wp-admin/options-general.php?page=image-gallery-reloaded/image-gallery-reloaded.php

One of the parts that has been removed when “forking”, is the part that actually makes admin options work. So my advice is to install IMAGE GALLERY RELOADED instead

It′s an old thread but i actually had to make some changes to code to achieve this, so i′ll share for future googlers.

With this solution images will be ordered in the order they appear in shortcode

SOLUTION
Search in folder wp-content/responsive-media-gallery/responsive-media-gallery.php

In there you will find a function called “igr_gallery_shortcode”.

1)Add ‘custom_order’ => false, to array passed to extract, around line 132.

2) We add an if clause for using our custom order

if( $custom_order ){
			foreach( explode("," , $ids)  as $id_img  )
			{
				$attachments[$id_img] = $_attachments[$id_img];
			}	

		}else{

			foreach ( $_attachments as $key => $val )
			{
				$attachments[$val->ID] = $_attachments[$key];
			}

		}

You will end up with something like this:

function igr_gallery_shortcode($attr)
{
	global $post;
	$options = get_option('igr_options');

	if (isset($attr['orderby']))
	{
		$attr['orderby'] = sanitize_sql_orderby( $attr['orderby'] );
		if ( !$attr['orderby'] )
			unset( $attr['orderby'] );
	}

	extract(shortcode_atts(array(
		'orderby'		=> 'menu_order ASC, ID ASC',
		'id'			=> $post->ID,
		'itemtag'		=> 'dl',
		'icontag'		=> 'dt',
		'captiontag'	=> 'dd',
		'columns'		=> 3,
		'size'			=> 'thumbnail',
		'include'		=> '',
		'ids'			=> '',
		'custom_order'	        => false //parameter added
	), $attr));

    $count = 1;
	$id = intval($id);

	if(!empty($ids))
	{
		$ids = preg_replace( '/[^0-9,]+/', '', $ids );
		$_attachments = get_posts( array(
										'include'			=> $ids,
										'post_type'			=> 'attachment',
										'post_mime_type'	=> 'image',
										'orderby'			=> $orderby
										)
								  );
		$attachments = array();

             //Select if we want to order images like its declared in shortcode

		if( $custom_order ){
			foreach( explode("," , $ids)  as $id_img  )
			{
				$attachments[$id_img] = $_attachments[$id_img];
			}	

		}else{

			foreach ( $_attachments as $key => $val )
			{
				$attachments[$val->ID] = $_attachments[$key];
			}

		}

//thats all the rest of the function remains the same

Now you can use shortcode in this way:

[gallery ids="576,579,571,572,573,574,578,575,577,580" orderby="none" custom_order="true"]'