Ok I have narrowed the embed code down to this:
Original Code from your plugin:
<iframe class="attp-yt-iframe" width="300" height="230" src="
http://www.youtube.com/embed/N08_UW3yCRU?autoplay=1" frameborder="0" allowfullscreen="allowfullscreen"></iframe>
if the embed code is changed from
http: to
https: or just eliminate the http: all together then everything works. Here is an example of 2 embed codes that work:
<iframe class="attp-yt-iframe" width="300" height="230" src="
//www.youtube.com/embed/N08_UW3yCRU?autoplay=1" frameborder="0" allowfullscreen="allowfullscreen"></iframe>
<iframe class="attp-yt-iframe" width="300" height="230" src="
https://www.youtube.com/embed/N08_UW3yCRU?autoplay=1" frameborder="0" allowfullscreen="allowfullscreen"></iframe>
Please let me know if I can fix this myself?