Within my blog posts if you click on any of the images you get the following error:
Fatal error: Call to undefined function wp_get_the_attachment_link() in .../blog/wp-content/themes/bp-daily/library/functions/loop-functions.php on line 225
BuddyPress Daily Child 4.1.7
We do use Edgecast CDN with W3 Total Cache.
To see this go to the following and click on an image:
Any clues as I can't see anything obvious.