About a couple of weeks ago, I came across this problem with YouTube on my Galaxy S3. Flash player is latest 11. I have updated the YouTube application. When I try to play a video it says that video cannot be played (no, it's not a blocked video because I can play it on my PC). I tried using the internet browser and the YouTube application, but it's no use, they both give the same error. I also tried this on HSDPA mode and on Wifi mode, but again, no use. What to do?