That plugin is doing a terrible practice of loading wp-load.php
outside of WP on its own.
Ref: http://plugins.svn.wordpress.org/easy-media-gallery/trunk/includes/easyloader.php
error_reporting(0);ini_set('display_errors', 0);
$parse_uri = explode( 'wp-content', $_SERVER['SCRIPT_FILENAME'] );
require_once( $parse_uri[0] . 'wp-load.php' );
This is so bad it should be a joke
See http://ottopress.com/2010/dont-include-wp-load-please/
Unfortunately you will run into more issues running Bedrock than you would otherwise. The good news is you’ll find out right away which plugins aren’t coded properly. I can say with almost 100% certainty that if a plugin doesn’t work with Bedrock, it’s their fault.
edit: ABSPATH
doesn’t work because they’re just including wp-load.php
outside of WP without loading the config or anything.