Cannot access Media Library

When I try to load the Media Library to insert a photo on a post I just get a blank page with a thinking symbol:
http://screencast.com/t/MlpM0LTio
This just started happening after switching to a child theme for Enfold. I saw another post similar to mine, but the solution was to remove the trailing ?> tag in the php.

My functions.php is:

<?php

/*
* Add your own functions here. You can also copy some of the theme functions into this file. 
* WordPress will use those functions instead of the original functions then.
*/

/* 02/18/2016 Added from backup to Child Theme */
add_filter( 'avf_google_heading_font',  'add_custom_open_sans');
add_filter( 'avf_google_content_font',  'add_custom_open_sans');
function add_custom_open_sans($fonts) {
	$fonts['Open Sans Light'] = 'Open Sans:300';
	return $fonts;
}

require_once( get_stylesheet_directory() . '/comments.php' );