I noticed that you guys are trying to load in the http:// uri path instead of the directory /var/www/ path when loading in xml files for custom images and slideshows. From my experience most shared hosting environments are not going to allow you to override "allow_url_include" in a php.ini and will have it disabled by default. I'd suggest utilizing something other than the the actual web address when utilizing a custom directory. Utilize the
trailingslashit( get_stylesheet_directory() ) . $customDir; instead.
Just a suggestion.