"We were unable to load Disqus. For more information please see our documentation on identifier and urls."
I updated to WordPress 3.13 and then updated Disqus from within the wordpress admin panel. Disqus failed to load on the frontend. So after reading the Disqus plugin page I renamed the folder from 'disqus-comment-system' to 'disqus'. This didn't work so then I removed the directory, downloaded again and re-activated. However the name of the new folder downloaded was 'disqus-comment-system'. Confusing!?
I will revert back to the previous version for now