Came across a bug in the plugin this morning. If the Vimeo link uses https in its URL, the plugin builds the iFrame src URL incorrectly.
For example, if you try to use the Vimeo link https://vimeo.com/42617831, the plugin will set up the iFrame as:
<iframe id="vvq-45381-vimeo-1" src="http://player.vimeo.com/video/https://vimeo.com/42617831?title=1&byline=1&portrait=0&fullscreen=1" width="400" height="300" frameborder="0"><a href="http://www.vimeo.com/https://vimeo.com/42617831">http://www.vimeo.com/https://vimeo.com/42617831</a></iframe>
Notice that the URL being used for the iFrame src is http://player.vimeo.com/video/https://vimeo.com/42617831 instead of simply http://player.vimeo.com/video/42617831. Thanks.