Visual Editor not working on WP 3.9.1

@vertigofactory, your solution doesn’t work for me unfortunately 🙁

Thanks! @vertigofactory, you saved my day…
I also used the previuos solution:
http://wordpress.org/support/topic/adding-content-to-wysiwyg-dupes-in-native-wp-content-editor

my conflict with the tinyMCE started with the team:
-WP 3.9.1
-ACF pro,
-mqtranslate 2.7.1.1 and
-ACF qtranslate fields plugin
I have tried with the tinyMCE advanced and also works!

Now is ok.

Thanks! @vertigofactory you help me a lot but all this solution doesn’t work for.

My probleme is that the wysiwyg editor work but when I tried to save my english and french field it trigger “admin-ajax.php?loadSript” indefinitely and never save the post and I have to relad manually my page to stop that.

After long hours of debugging I find this on ACF qtranslate plugin in input.js file line 13.

// if a TinyMCE hasn't been initalize for this language then initalize it
if (!parent.find('.current-language .mce-tinymce').length) {
    acf.do_action('ready', parent.parents('.acf-field'));
}

I have to comment this code to make it work but I can only right the default language because the second box not initiate. I search a lot but never find something about this function…

I’m on :
WP 4.0
ACF Pro 5.0.9
acf qtranslate 1.4
and mqtranslate 2.7.1.1

I have the same problème on WP 3.9.1
I also used the previuos solution of @elkiloprieto but didn’t change anything…

Thanks for you help!

Hi,
@vertigofactory, your solution doesn’t work for me but I update the plugin mqtranslate to the version 2.9.1.2 and work.