I'm trying to determine if the problem is a "failed" update, since Opera is giving my version as 70.0.3728.119 (the prior one) and cannot update ("An error occurred while checking for updates"). Something has gone horribly wrong. With the timing, I'm fairly sure it's an update problem. Nothing else in my system has changed.
I think my only option would be a completely clean install. Which I'm not best pleased about, obviously.