In some navigators (at least firefox and safari) vimeo (and probably others?) embeded videos are not loaded if the page loaded as https:// works ok if changed to http manually on address bar.
I know that the Vimeo embedded was recently (within the last 24 hours) worked on. If you could try again and see if you still have this issue. Also, if you could provide a direct link to the post/thread you’re using as a reference, that would be a big help.
Works fine now 
Thanks!