Uploading files won't work properly for me in CKEditor. The file does get saved but looking at the parameters there is no authenticity token which resets the session, then I can't update the post.
The token is set in the form but CKEditor doesn't seem to send it for picture or file uploads. I think this may have been OK when I used CKE with Paperclip, but not certain of that. All other CKE operations work.