I have the Nook tablet. I have been watching Youtube videos since I got it (3 weeks ago), but Monday it would take me to Youtube, the opening shot of the video is split screen, and when I hit the play feature the screen goes black. Videos from other sources work fine. Last night a dialogue came up when I hit play and it said "this video cannot be played on a mobile device." However, I had watched the video numerous times before that (it was my favorite to show off my new tablet). Hope this helps.