Youtube recently updated their URL structure. Now, if you click Share below a YouTube video you get a short URL, with a structure like http://youtu.be/PNyMlswZb-I, instead of the older format http://www.youtube.com/watch?v=PNyMlswZb-I. The shorter URL is nice for sending the URL around to friends or tweeting. However, some Drupal sites that use short codes, such as ">http://www.youtube.com/watch?v=PNyMlswZb-I] for embedding Youtube may need to be updated to work with the new URL structure. We'll be checking the sites we've launched and contacting you if your site is among those effected. Additionally, some older versions of WordPress may not work with the short URL. If the short version of the URL does not work, you can always get the longer version by clicking the Show Options button next to the URL and choosing Long Link: Recent versions of WordPress (we have 3.1.13) seem to work with pasting either the short or long URL into the body area (Visual tab).