I'm on a Macbook Mac OS X 10.6.8
I'm thinking it's some kind of bug or setting.
Just randomly, on a YouTube or other news sites, the video will begin playing but the audio doesn't.
Then if I go back to that video later, it might play perfectly. There's no rhyme or reason to it.
Yes, I restarted. Yes, I shut down, waited a while, and started it up again.
This example is just audio but, my favorite online radio station www.aomradio.com won't play. Well it says it's playing but I don't get any audio. Other stations play, like encouragingradio.com.