This is an issue with Vimeo also... they are moving over to all https and AME won't embed the https. Also, AME won't embed youtube vids that are not of this format:
http://www.youtube.com/watch?v=0MOlGyeE6ps
If it has anything like below, such as &feature, or &related, they won't embed. They have to be the 'long link' as shown above.
http://www.youtube.com/watch?v=0MOlG...eature=g-all-u