Few weeks ago I could watch without a problem an .avi video that I put on my external sd card but now it won't play. I get the same "Sorry, you can not play this video" message when I try to play "Moments of everyday life" that came with my tab. The only thing that I changed that comes to mind is that I installed Flash player. I hope it has nothing to do with that, I wouldn't want to have to choose between watching videos on internet and offline.