My solution is to simply turn off Rocket Loader on Cloudflare 😉
In this moment i’ve no time to test the procedure in the article i found.
The problem was found, after a heavy troubleshooting.
I’m using CloudFlare as CDN, and it have a thing called Rocket Loader, but is in beta. If you enable it, you’ll have the problem i described. For now i don’t test a solution, but i found an interesting article here: http://wp-dreams.com/cloudflare-rocket-loader-for-wordpress/. Maybe i’ll try this in the future.