Google Libraries plugin also fixed this problem for me. Some specifics if someone is trying to troubleshoot this.
Before the fix:
OS Windows 7 Home Premium,
Browsers neither Chrome or IE worked
All plug-ins disabled
wp-langs-en.js present in the tinymice lang directory. no “en.js” file
Refreshed cache multiple times. Did full flush on cache in Chrome tools
On HTML editor no commands were visible on the toolbar except media upload (which worked) HOWEVER when I checked the “Disable the visual editor when writing” box in the user profile the HTML commands in the toolbar appeared. Unchecking the box returned things to where they were.
Installing the “use google libraries” plugin fixed the problem. Deactivating the plugin returned me to the broken visual editor status.
I wouldn’t be surprised if this is a theme related problem.
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