Visual Editer Stopped Working in 3.5.1

After a few weeks of having 3.5.1 installed – the visual editor stopped working. The visual editor button is there, but I can’t click on it. All I can use is the HTML editor. My entire kitchen sink is gone as well.

I know this is a problem that has plagued others and some have been able to fix it using a variety of solutions. None of these have worked for me. Here is what I have tried:

Disabling all plugins
Reinstalling WordPress
Using the Google Libraries plugin
And, yes, the ‘disable visual editor’ box is NOT checked and, yes, I have refreshed the cache multiple times.

This happened on about 6 of my sites – all on the same host. The host assures me it is not a WP issue. None of the sites are on the same theme so that’s not a problem. Some of the sites don’t have any plug ins so it’s not a plug in issue.

I am at a complete and utter loss as to how to fix this!