Using Cloudflare for HTTPS, empty preview pane in edit page

Also I noticed a bug due to the Force https activation: The bouton for accepte invitation doesn’t work anymore!

And when disconnected and try to reconnect, we were redirect to the login page. Impossible to connect!
Only this warning then:

GET http://forum.exemple.com/ [Mixed Content]             [HTTP/1.1 301 Moved Permanently 200ms]
GET http://forum.exemple.com/login [Mixed Content]        [HTTP/1.1 301 Moved Permanently 0ms]

"DEBUG: For more advanced debugging, install the Ember Inspector from https://addons.mozilla.org/en-US/firefox/addon/ember-inspector/"  ember_jquery-a8dcbd325e04410f036f2a791d66d8316c48c5387acdd914de99a5dd6afb3cd3.js:9:330

Synchronous XMLHttpRequest on the main thread is deprecated because of its detrimental effects to the end user’s experience. For more help http://xhr.spec.whatwg.org/  lpfulllib.js:1:20054

So I removed the Force https mode and that work again.
So still have the main problem in Edit page. If you have another solutions …