Same here - installed Opera today, as I have done from time to time over the past ten years, only to find that NO YouTube vids will play. Love the VPN Opera now has, but this is a major flaw. Seems there's always something that keeps Opera from being my browser of choice.
I share what you like about Opera. Your experience with videos is similar to what I am experiencing in Twitter. This problem is keeping me from going to Opera full-time.