Hi guys, I have just reinstalled a fresh copy of Mountain Lion up to 10.8.4 and also the latest version of Flash however when I go to Youtube and watch a video on fullscreen in Safari, it doesn't play it in HD automatically as it used to before. I have already had settings saved as 'Play highest settings' in the Playback option however no matter which video I play, it still wouldn't do that. I installed Chrome and there were no problems streaming automatically to HD on fullscreen hence my conclusion is that it isn't Youtube but Safari itself. Prior to reinstalling Mac OS, I never had such problems with Youtube playback on Safari. Wondering if anyone has got such issues and a remedy would be much appreciated even though I know I can probably switch over to Chrome. Just sucks that it's happening really.