@leocg Since all worked after a while, and instead using Google, I do not believe this is the cause. Opera should answer here, because in my opinion this happened because Opera is in a constant fight against Google YouTube, to avoid advertisements. This is of course not acceptable for Google and like in the world happens: when there is an enemy, they attack.

I get already for a while, very frequently messages from Opera, that they updated YouTube on the background. It is now more than 24 hours later and there was no further interruption. So, it was, I am certain, a battle created by Google, against Opera. And Opera, if you read this, you should answer here yourself, be transparent about the why YouTube is so often updated on the background, and if this has to do with what I experienced, that suddenly you were too late to update and tsjakkaaa, hacked. By Google.

@leocg Are you joking? When a page does not load, or not loads well, the working of the loading shows as circling. Cannot explain further.

@leocg The content was constantly circling around (the report an issue page, of Opera itself) and the website Substack and was a complete mess. YouTube: an empty page. Google browser did not offer any problem, so the issue was an Opera issue.
It is back in the meantime.

When "Substack" was not working anymore, I tried to mention a bug via "report an issue", but there all is not working either.