We're using different blockers, which is probably why we get different results after reenabling.At first I had the same problem on my laptop (desktop uses firefox)... but my chrome was out of date. So I updated it.
Didn't fix it.
So I disabled ublock origin.... and they started working.
Then I re-enabled ublock origin... and they continue to work.
I have no idea.
But we haven't updated the media plugin, so whatever it is, it's something coub is doing on their end.