Visual editor and buttons not working when editing posts

Hi
When i try to edit a post the visual editor doesn’t appear.
It only appears the HTML code in white letters (white background also).
All the buttons on the right won’t work neither (status, visibility, etc)

I’ve tried adding manually an <p>HELLO</p> to the code and update and it seems to work, but the visual editor doesn’t show up and the letters are all white on white backgruond so it’s impossible to edit like that.

Things that i’ve already tried

– Tried editing on different computers
– Disabling all plugins
– Installed and activated “Use Google Libraries” Plugin
– Added to wp-config.php

define(‘WP_DEBUG’, false);
define(‘SCRIPT_DEBUG’, true);
define(‘CONCATENATE_SCRIPTS’, false);

– Clearing cache on all the browsers (chrome and firefox)

When i create a new post it works like a charm, but when i edit posts the problem shows up

any ideas?