Hello,
Same problem here. The bug comes from the WCK’s tinyMCE installation. tiny_mce.js tries to load dynamically ‘js/tinymce/langs/en.js’ relative to the current URL, giving ‘https://mysite.com/wp-includes/js/tinymce/langs/en.js?ver=359-20131026’ in my case.
There is effectively a path to /wp-includes/js/tinymce/langs/ but the file ‘en.js’ is (now?) named ‘wp-langs-en.js’ (here using WordPress 3.8.1). Copying ‘/wp-includes/js/tinymce/langs/wp-langs-en.js’ to ‘/wp-includes/js/tinymce/langs/en.js’ will make the WYSIWYG editor work, but it’s not quite right doing so, since I want my WP core untouched.
Why WCK doesn’t use the TinyMCE provided by WP, anyway?
Thank you,
Paul