This began fairly recently as far as we know. Videos will not play if they are Vimeo links, in Chrome and on macOS (at least, macOS on Mac Pros. It seems to work all right on MacBOOK Pros, since they play and therefore it stops me from trouble shooting at home).
We have tried everything, up and including reinstalling the Haru Circle Core plugin, which does, in fact, fix the video playing issue, but presents a new one – in the lightbox/modal/pop-up lay over that the videos are contained in to play, they are reduced to thumbnail size.
We need them to both play and be the correct size. What do I try next?
(You need delete then reinstall plugins)
And please make sure you inserted Video ID only (for both Youtube and vimeo)
After Update our theme, we have just added new short code named Haru Video Ajax Category for the best load: http://prntscr.com/myefgz
Hope this help!