I am struggling with this as well. With images it works, but with embedded videos it does not provide the thumbnail. It worked a couple weeks ago but not now. So, I think it is caused by a plugin. I have tried to deactive a number of plugins but still no luck. Anyone have any suggestions. It isn’t working on either of my sites: http://www.truetravellers.org or http://www.stuffyoushould.com
thanks for your help
