Apparently you can no longer full-screen a video directly from a G+ post. You have to click through to YouTube (which opens anew tab), deal with whatever ad requirements there are over there, fullscreen the video, watch/enjoy, then close that tab out and come back to G+.
Sometimes this nonsense is just more exhausting and annoying than it’s worth. I’m going to bed.
A Pun Involving Travel 
I just tried it on the same video and it worked fine.
LikeLike
This is almost certainly a result of being in the HTML5 experiment.
LikeLike