About a couple of weeks ago, I came across this problem with Youtube on my Galaxy S. Flash player is latest 11, I'm using Froyo and I updated to latest 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, and no, it's not a video that's unavailable on mobile devices because it would say so even before trying to play it). 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 Wi-fi mode, but again, no use. I would appreciate a solution.