Pretty much the subject line. uBO has successfully blocked the nag screen enough times that I can’t play anything at this point. No preview loads, and the play button serves no function. I’d really prefer not to have to find content on YT, copy the URL and use Piped/Invidious, but this ongoing escalation is steeling my resolve to screw Google.
And make sure to read the guide. I think they recommend setting the extension to defaults. As fiddling with the settings and enabling additional filter lists can cause this.