Please read through http://wordpress.org/support/topic/wordpress-39-master-list?replies=6 and see if your issue is addressed there.
There may be a plugin or theme issue with that particular site that impacts the updated visual editor.
I tried the methods present in this post but none works
Do you use Ultimate TinyMCE? If so it will no longer work with 3.9.
No, I not use Ultimate TinyMCE
I found a blog that someone has the same problem as me, he made a screenshot, please no one has the solution?
If you have a plugin installed that modifies or adds to TinyMCE, it’s possible that it could be the cause of the trouble. I noticed your screenshot has an “ABC” button that my editor doesn’t have. Try temporarily disabling plugins one by one to see if you can figure out if one of them is causing the problem.
I’ve tried disabling all plugins and change the theme but it does not work. ABC is part of the Jetpack plugin
Before I forget the link to the blog that has the same problem as me : http://rezkinasrullah.com/wordpress-3-9-tampilan-editor-baru/
That looks like a cache issue.
Have you hard-flushed the cache on your server and your browsers?
Yes, of course I did and I also tested on several browser
On the -server- though, did you make sure to force that to flush?
Try adding this to your wp-config:
define('SCRIPT_DEBUG', true);
It should go ABOVE the line that says ‘stop editing here’ 🙂
I added this line in my wp-config.php and the content editor is back to normal as before.
How is he? But the board not debug mode is enabled for to stay all the time?
“It is not recommended to use WP_DEBUG or the other debug tools on live sites; they are meant for local testing and staging installs.”
https://codex.wordpress.org/Debugging_in_WordPress
That proved what I said 😀 The script-debug forces your browser (or your server) to stop caching CSS and JS. It’s fine to leave on for a while, just means you get the non-minimized code.
Do you have Pagespeed or CloudFlare or any sort of proxy on your site?
When I put on Cloudflare development mode (mode that disables Cloudflare) everything works fine even with debug off!
But I would still keep Cloudflare, I have another blog or it works very well with Cloudflare enabled
