I have a new WP 3.6 install and have never run into this

I have a new WP 3.6 install and have never run into this situation before. For some reason my RSS feed does not display the domain name with the thumbnail URL so all thumbnails are broken in the feed.

The domain is not defined in the wp-config.php file because if I do then the domain name is doubled in links.

The feed in question is at http://wfncnews.com/feed