Sound not working for internet, but does for other applications

I cannot get sound when I go to sites with sound, like youtube. Yet I can when I use Rhythmbox. The thing is that it DID work a week ago, but I don't think I had Rhythmbox up and running yet. So I probably messed something up with trying to get that to work. I think it has something to do with my "sound capture". I say this because it was the only option under my preferences,sound area that would not make a test sound. It is currently set to ALSA, but will not work for any of them (except the option to change it to test sound, but that doesn't do me any good.) Any ideas?

I couldn't get flash + other sound app to play sound at the same time until I did

sudo apt-get install libflashsupport

HTH

It still doesn't work. Any other ideas?