Hi, am working on a Drupal 7 server with CDN enabled to a non-Amazon/Rackspace/etc. CDN and have encountered this behavior with CKEditor 4.3:
If I upload an image via the Add Media button, the image loads into the preview mode fine. When I publish and view the post, the full image is visible. But if I Add Media again, then the thumbnail for that image under the Gallery tab is broken with a 401 error (the CDN I think does this because the file doesn't exist so it throws up a basic auth popup).
However, if I were to, say, edit the view for the gallery popup, then the thumbnail loads correctly in the Drupal preview panel.
I tried this on a localhost server and on a staging server (that had CDN enabled) and they both worked fine.
I am assuming something on the first server is preventing the thumbnail from being generated, since the thumbnail is being generated on the other servers (at first I thought maybe the generation wasn't being triggered via ajax or something). I don't really have all that much access on that server but I was wondering if this problem rang any bells for anyone.
It's not critical but our users may be confused by seeing a broken image icon when they're adding media.
Thoughts?