Visual editor

This worked for me:
https://www.ads-software.com/support/topic/heres-a-fix-i-found-for-the-bug-with-visual-editor-in-wordpress-39?replies=22

https://gist.github.com/warenhaus/10990386

Replace qtranslate_hooks.php, qtranslate_javascript.php and qtranslate_wphacks.php with the code found in the link.

It’s actually for 3.9, but I’m on 4.0 and it works!