@chris - Yes, it is essentially a Vimeo problem.
Here are the Vimeo privacy settings. It mentions how the settings affect how other websites can embed Vimeo videos.
I’ve been able to view the video. The vimeo privacy settings may have been modified also, I don’t know ??
Here is how I got it to play. If , for example, the message appears and the “Open site in new window” doesn’t work, there will be a Vimeo video URI. For example - https://vimeo.com/146045288
Try re-referencing the Vimeo video by using https://player.vimeo.com/video/146045288
That worked for me. 
