After latest Opera update, getting videos with error notice. If clicking for 'help' it suggests connection problems, troubleshooting or changing browsers. Problem does not occur on other browsers, or if I log out of YouTube.
When ignoring the error, video will play anyway, meaning there is no actual error, there is an add/app blocking play for several seconds.

Problem comes up like this: "There was an error. Please try again later. (Playback ID: YdYNekRt8NegpwAS)" ID changes every time.
These error messages display a play time of a few minutes, not matching the minutes of the video clicked on.
For instance, if I click to play a 7:46 min video, I will get an error message on a 1:34 min video with one ID video, which I ignore, then it will blink/switch to an error message of 3:28 min video with another ID, which I also patiently ignore and then the video I clicked to play starts playing...

This is clearly not a problem with neither the video I clicked to play or YouTube itself, but something added on to YouTube, like adds, which should be blocked by Opera.
Since it doesn't occur in other browsers or when logged out, it seems to have been made for Opera specifically.