What steps will reproduce the problem? 1. open: http://www.yfrog.com/api/oembed?url=http://yfrog.com/el3fxz

I get:

{"version":"1.0","provider_name":"yFrog","provider_url":"http:\/\/yfrog.com","thumbnail_url":"http:\/\/yfrog.com\/el3fxz:small","width":480,"height":360,"type":"video","html":"http:\/\/yfrog.com\/el3fxz:embed"}

Response doesn't have valid embed code, see value of property 'html'.

Another problem is that the thumbnail_url doesn't return an image. Yfrog's oEmbed support is severely broken right now.