The only reason I ask, is because if you select the following option:
Deselect this option to disable all caching functionality.
Then W3TC plugin expects you to enter a CDN hostname (there is that pink warning box that stays at the top unless you enter the hostname). Here is the error:
" Content Delivery Network Error: The "Replace default hostname with" field must be populated. Enter the hostname of your CDN provider. This is the hostname you would enter into your address bar in order to view objects in your browser. "