It’s on other browsers as well. I get the screenshot @Slowhand posted when I use Microsoft Edge (on Windows 10).
If I try to use Firefox on such a video, I don’t get any error message, but the video doesn’t load, it just remains stuck at the part where the little purple circle is spinning.
EDIT: With Firefox, I just tried what @Series5Ranger wrote (pause the video, then unpause it) and the video actually starts playing now. I didn’t try it for every series I’ve listed, but so far it seems to work for Firefox (thanks for the tip ).