Pages are not caching

This plugin is great…when it works.

Half the time it doesn’t work, and I’ve no clue why.

My site is a one-page website, and no matter what it just doesn’t cache. I clicked on “Start Prebuild Cache” and even force it by clicking “Cache Page” but nothing happens.

* I’m using CloudFlare and I believe it’s being set up properly (same settings as another site that works)
* I have NOT disabled wp-cron

Any idea anyone? Thanks..

The page I need help with: [log in to see the link]