I'm running wp3.1.3, testing with Firefox, IE and Chrome, and all browsers showed the error. My website/blog is http://www.gazehound.com
Since upgrading to 3.1.3, my visual editor went missing. When I click the Visual tab, which is still there and "live", it would give me the html editor with the button bar removed instead of the visual editor. I've spent days reading older posts in this forum from many people who've had the same problem in the past. The vast majority of them had a long list of things to try, which the people would try, but they wouldn't work, and someone would close the topic as "resolved" without any real solution being posted. Others were closed as "resolved" as soon as the question was asked, with no answer posted. The few people who did have some success in getting their editor back, however, did so by discovering an interfering plugin.
This morning, I tried disabling all of my plugins (I run Atahualpa as my theme, and my entire site pretty much depends on the theme structure, and wouldn't run without it--it's upgraded to the latest version each time a new version comes out), and have quite a few plugins I depend on. I then re-enabled the plugins, one at a time, and tested for the visual editor after each one was enabled. The visual editor reappeared and worked properly after enabling all but THREE of the plugins. The three plugins that broke the editor (and unfortunately a couple of them have been essential to the site for some time, though the third I can do without) are:
Jetpack by WordPress.com
I can do without the polls, but both the NextGEN gallery and Jetpack are important to the running of my site in many ways.
I've posted this here in the hopes that there is "something in common" between these three plugins, and this will help the developers to figure out what it is about them that breaks the visual editor in WordPress 3.1.3.
AND: Are there other plugins, that actually work without breaking anything, that I may use as substitutes for the above? I'm told there's no way to access WordPress.com stats, which are invaluable, without Jetpack any more, is this true?