As the subject says "The video embed code shows a white box in 7.1.2". Just a place holder looking square. The video is a Youtube video. I thought the embed option was fixed in this version. I have not messed with this much. Here is the code copied straight from the page for the video.
<object width="425" height="344" style="display:block;"><param name="movie" value="http://www.youtube.com/v/&rel=0&color1=0xb1b1b1&color2=0xcfcfcf&feature=player_embedded&fs=1&autoplay=0"></param><param name="allowFullScreen" value="true"></param><param name="wmode" value="opaque"></param><embed src="http://www.youtube.com/v/&rel=0&color1=0xb1b1b1&color2=0xcfcfcf&feature=player_embedded&fs=1&autoplay=0" type="application/x-shockwave-flash" allowfullscreen="true" width="425" height="344" wmode="opaque"></embed></object>
To me the url looks odd but I am not familiar with this .