This is This is a very annoying issue; I’ve been struggling with it with a friend’s WordPress 3.5 install. It really doesn’t help that the minified TinyMCE code is so opaque, making debugging basically impossible. Observations:
– The issue appears to be browser-specific. The visual editor fails to load in Firefox and Chrome, but works in IE9.
– Copying wp-langs-en.js to en.js does indeed resolve the problem. However:
– My personal WP installation does not have an en.js file, and yet works flawlessly in all browsers.
– I noticed when performing some file diffs that the files on my friend’s install had DOS newlines, while my own have Unix newlines. Red herring or clue? Not terribly motivated to spend more time figuring it out, but worth a mention.
