At first the problem only appeared when the SKUID page was produced via a Community page and I thought it was somehow related to the domain portion of the URL. But then later in the afternoon I got the opposite result, the community page was rendering the CKEditor panel when you clicked on a RTF field and the same page when viewed internally suddenly would generate 404 errors (which ruled out the differences in the URL being the potential problem).
This is what it looks like when it works. When it doesn’t it just appears without the CKPanel.
When I copy the URL and paste it directly into the browser I get a URL does not exist error displayed in a Salesforce frame.
I am at a loss as to what my next step to troubleshoot/fix the problem should be if its an intermittent 404 error causing the problem with files its trying to load for ckeditor.