thanks for the great plugin.
it was working great until i decided to keep keep wordpress in its own directory and still use the root domain to point to it.
in short i changed site url in setting to my domain only without wordpress directory.
the hr.js is not loading because you hard coded the url to plugin directory. i fixed that like this:
edit line 21
define( "SB_PLUGIN_URL", plugin_dir_url( __FILE__ )."/wp-content/plugins/" . SB_PLUGIN_DIR );
define( "SB_PLUGIN_URL", plugin_dir_url( __FILE__ ));