I don't know if this is a WP 8.1 issue it something but last week I could still watch YouTube videos, now it seems like it's impossible. I have Metrotube installed, and there's an error when playing, so I play it through internet explorer, and then it loads but never plays! So I tried UC browser..now it says CAN'T PLAY IT ON YOUR PHONE. I tried other players, just loads and loads. I have good internet connection, I can okay videos from other sites but not Youtube. My bro and sis' Android phones can play!!