Hi again,
I have just deleted all files from my server, replaced the backup 2.6.3 to the server,(the latest good working version) and updated it to version 2.6.5. Now all is working fine again. Earlyer i only did the update 2.6.5 again, but that was not working. Only full delete and replace the backup solved the problem.
dear Otto42,
I have the same problem! Your image shows a visual editor option above the admin colorscheme. I think thats the problem, because also by me this visual editor option is not there ! My personal option starts with the color scheme. I use wordpress 2.6.5
