I updated to 2.1 last night and spent some time fixing my theme with WPG2. A few minutes ago I went to create a new message and received this same error. I usually use IE as my browser so I loaded FF… it works there. This seems to be an issue related to IE 7. Hopefully this will help give some direction for a solution from the wordpress staff and give you a work around Desdichado.
CK
This problem seems to be affecting many people (including myself).
The latest version of the TinyMCE Javascript editor is flawed and does not work under IE7. Like craigkozak, I got it to work under FireFox, but it is upsetting that the TinyMCE programmers do not seem overly concerned by this problem and have not yet provided any patch.
Technically, it’s not a WordPress bug but WordPress should recognise this is affecting every one of their IE users.
Thanks. Trying it with Firefox. Frustrating indeed. I did find an earlier sting (http://wordpress.org/support/topic/101659?replies=25) on this that had a suggested patch to the TinyMCE JV, but that didn’t work either. Hopefully they’ll resolve this soon.
Desdichado
Well, I tried it with Firefox. Writing a new post works great. Editing an old one, sadly does not. Buttons for visual comes up, but pushing it does nothing.
Clearing the FF cache has been reported to help.
Thanks. For now, I have switched back my previous version as it was working fine for my uses. Hopefully, this will get resolved though as I did like some of the tweaks in 2.1.
Hey everyone. I had the same problem but when I turned off my theme switcher plugin all was well. Maybe try that 🙂