Hi.
I got the following answer from vimeo:
 
 <table role=”presentation” border=”0″ width=”100%” cellspacing=”0″ cellpadding=”0″>
 <tbody>
 <tr>
 <td width=”100%”>
 <table role=”presentation” border=”0″ width=”100%” cellspacing=”0″ cellpadding=”0″>
 <tbody>
 <tr>
 <td valign=”top” width=”100%”>Greg (Vimeo Support)
Apr 17, 12:40 AM EDT
 <div class=”zd-comment” dir=”auto”>Hi Abraham,
We apologize for the inconvenience. We’ve recently added a new mute embed parameter (muted=0) to our player, which has unfortunately broken any videos that were previously using another workaround to allow sound.
If you would like to un-mute your background videos, please update your embed code to include the muted=0embed parameter. For example:
<iframe src="https://player.vimeo.com/video/76979871<b>?background=1?muted=0</b>" width="500" height="281" frameborder="0" webkitallowfullscreen mozallowfullscreen allowfullscreen></iframe>
Since you are using a plug-in to contain your video, you may need to reach out to the creator of that plug-in for further assistance.</div></td>
 </tr>
 </tbody>
 </table>
 </td>
 </tr>
 </tbody>
 </table>
  
I guess you can make a general fix for the template. If by any chance you do it. Can you let me know?
Thanks a lot
Abraham