Visual Editor doesn’t work on 2.6.5 :-(

Hi,

I’ve just been upgrading from 2.3.something and now I see the Visual Editor and the HTML tabs, but pressing on it does nothing. When I disable the Visual Editor in my user settings the tabs are gone and I see a row of HTML buttons.

When I enable it again the buttons are gone and the tabs still aren’t working.

I tried both Firefox and IE and in IE I get some cryptic JavaScript error.

I re-uploaded everything but it didn’t help either.

Any suggestions?

PS: I’m using the german language pack.