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Thank you very much! I was having the same problem and followed those instructions for a resolution. In my case, the problem was an outdated theme.
Thread Starter
Loni
(@vegasinc)
I located a recommendation in another thread to upload and enable “Use Google Libraries” which can be found at http://wordpress.org/plugins/use-google-libraries/installation/
This seems to have corrected my problem.
I have exactly the same problem. It started with 3.7.1 and continues after I updated to 3.8 (this evening). I can edit in text mode but not visual mode. I have dumped cache and tried 2 computers with 4 different browsers. My user profile has not disabled visual editor. I have disabled all plugins and set to default WP theme at http://www.kiwanisofarlington.org. I still cannot edit in visual mode after any of these changes.