Did you check the volume control on the YouTube window? If that's not it, try disabling all extensions to see if it's one of those interfering.
You checked the sound control in the actual video that you are trying to view?
cadee2c said:You checked the sound control in the actual video that you are trying to view? Not on your computer, but in the video itself, down at the bottom of the video window, there is a speaker.
Ned said:I have both plugins and have had no problems with sound. If you disable one, I would keep the PPAPI plugin as Google will keep that one up to date. The other depends on Windows and/or Adobe to update and I wouldn't rely on that. But keeping both should not be a problem if both are at the same version.