Yesterday I wanted to show my brother the admin panel and explain how everything works, so he can update the website by himself, but the CKEditor didn't appear. He has Windows Vista with Google Chrome. Is this a known issue?
Can you please confirm that the editor does appear when you access the same admin panel using any other configuration - i.e. a different machine or a different browser?
This is to rule out any problem on the server side that might be preventing CKEditor from appearing.