I'm stumped. The only time I've seen CKeditor not display properly is when it's missing ckeditor files. (Or other site customizations are breaking it because of jQuery or other javascript conflicts ... but you said you haven't got any other admin mods installed.)
You're now asking me where I think the problem is.
But I've already confirmed, as have several others, that you're quite alone in your symptoms.
So, the problem appears to be on your end.
I've also given you instructions both in the readme and here in this discussion on how to add in additional languages to your ckeditor plugin. Have you done that? If not, why?
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