not sure about the other guy, but for me it just doesn't load videos. disabled invidious proxy once google murdered it, but it still refuses to load anything. maybe it's time to purge data and reinstall

Edit: Disregard my original reply, updated today and now it works again lol!

It launches for me (and I am in a plasma-wayland session FWIW), and it loads the thumbnails for all videos with no problem. When I click a video as if to play it, it appears to load up the main page for that video complete with play button, but nothing at all happens when I click the play button. Along the way are various api errors from youtube, but I think some of those came in even when things were working for me.

Basically I can get this far for any video: