full screen video button?

I am stumped.  I have been using Vimeo embed codes in my Storyline projects for the past year and half.  They work great....or at least they did.

I create the video, upload it to Vimeo and copy their embed code to my Storyline project. (the embed code includes the ability to scale to full screen), and then publish to my LMS.

Suddenly I can no longer scale any videos (old or new) to full screen.  Yet the embed code that I pasted in included this?!

Vimeo states that it is a Storyline issue...where you may be be suddenly modifying the embed code?

Where in the Story output can I see the video embed information to verify that it has not been altered?  

Here is Vimeo's response to my support ticket:

"Thank you for getting in touch. The reason your video is unable to play in fullscreen is because the embed code is missing the three required fullscreen attributes: “webkitallowfullscreen,” “mozallowfullscreen,” and “allowfullscreen.”

Our embed code includes these attributes by default, but if you’ve modified the embed code, or used another service to generate the embed code, it’s possible these attributes have been removed. Here’s an example of how a Vimeo embed code should look:

 <iframe src="https://player.vimeo.com/video/144901039" width="500" height="281" frameborder="0" webkitallowfullscreen mozallowfullscreen allowfullscreen></iframe>

Once these fullscreen attributes are included, your video will be playable in fullscreen once more."

I did include these in all of my videos.  Ironically -- those that worked before and haven't been touched in over a year, no longer work....and they think that is your fault?!  I just need some proof that it wasn't altered with Storyline.  Thanks!