Our clients, who uses CloudFlare services, need to do the following things -
1) Turn the CloudFlare captcha (challenge page) off.
You can do that in your CloudFlare account. Please go to
Settings->CloudFlare Settings->Security Settings->Security Profile->Use Drop down menu
and set the value to LOW.
More details you can find on CloudFlare Support Portal
2) Under Domain Settings please find Performance Settings Tab and turn Rocket Loader™ (Web optimization) off.
These settings will allow MotoCMS scripts to work properly. Thank you.