title: Iframe embedded video does not loop anymore
body: <p>We've got an application running which uses <code>//youtube.com/embed/</code>, <code>&amp;playlist=VIDEO_ID,VIDEO_ID</code> and <code>&amp;loop=1</code>, this worked perfectly until recently (no code changes in this application for a long time). Somehow Youtube ends the playback at the end of the playlist and shows related video's. I'd expect that setting <code>&amp;rel=0</code> might have some influence, though this actually resulted in the video just stopping. </p>
  
  <p>Is there any API change that I need to apply to get this working again? I can't find anything... Fun fact is that when using the AS3 version <code>//youtube.com/v/</code> with the same values, everything works just fine as it used to! </p>