Since the new OS X release i notice that when i watch a youtube video whenever the video is playing and buffering the sound and video are not sync and that's very annoying. I haven't tried other browsers yet so unsure if this is just an Safari issue.
Yeah I've noticed the same issue, quite annoying. Chrome seems to work a little better. Other streaming video sites have also been out sync on Safari as well.
Glad im not the only one with this problem as well. I thought it had something to do with the latest Flash Player, I removed it and re-installed Adobe Flash, but still the same problem...
Chrome run much better with Flash i use Safari with no Flash Player and switch to Chrome when i need the best way for me