After doing some poking around, I've determined that the best workaround is to visit a video by clicking the owner's channel, then going to their video from there.Playlists are broken at first(if you view their own page and try to play from there; clicking directly to the playlist via clicking the picture works), but a (possible?) workaround appears to be going back a page after getting the error, at which point it will load the video(needs to be done with each individual video, if you try to manually switch through them).Tell me if this works or not: I've only tried this myself, but since it's an internal error, it should work for others.
