Blank pages

Hi there,

We are seeing blank pages whenever the trailing slash of a post is ommited.

For example:
http://yournewswire.com/exploding-toothpaste-new-boogeymen-who-is-the-khorasan-terrorist-group

This produces a blank page, whereas this produces the correct page:

http://yournewswire.com/exploding-toothpaste-new-boogeymen-who-is-the-khorasan-terrorist-group/

Is this a known bug?

We have the latest version of W3 Total cache installed.

https://wordpress.org/plugins/w3-total-cache/