Internet Explorer 9 and 10 not displaying ckeditor (untested with IE8). Where the editor should be is just empty space. I am using the latest dev and libraries.
Console reports the following.
Failed to load resource: the server responded with a status of 404 (Not Found)
The requested URL "/sites/all/libraries/ckeditor/plugins/oembed/libs/jquery.oembed.min.js?t=D2LI" was not found on this server.
Sure enough the oembed folder is not present although I am using the full version. Having read the plugin description at http://ckeditor.com/addon/oembed I can't see how it is related anyway.
Despite the missing files, ckeditor is fine with Chrome. For the moment I have reverted to the version three libraries and these seem to work okay with IE