This is what happened to me, on all my 3 wordpresses:
It doesnt matter how many times I click on the Visual button... it is just DEAD... I am stuck with the code tab forever... (see image).
I have three sites with different templates, and they are all with the same problem.
What have I done:
1- Loged out, loged in, Turned On and Off the profile option to use and not use the enhanced editor.
2- Cleared my browser cash, even tested on different computers. Tested on Opera, Firefox, IE 6, IE7 and Safari. All the same.
3- Searched on this forum, and nothing helps me on fixing.
4- Re-Sent ALL the files from the latest WordPress 2.3.1 version and replaced all the files, and even that did not fix.
5- Changed my Templates for the classic template and the other default template, and they are the same...
6- It was working perfectly for a month after I installed the WordPress. Then the Visual tab died, so I updated to the latest version 2.3.1 and the Visual editor was fixed... Then again, after a few weeks... BAM... I got Stuck again.
I run out of ideas... there has to be something you guys can do, help!!! Please!