you both sure it's not your pc? also, sometimes youboob get kerfluffled when you change audio settings. close your browser, then go back on-line, all should be well.
The no audio came with an update.
On the video look for the speaker (lower left corner). There is probably an X by it. Put the cursor over the speaker and a bar will appear. Move it all the way to the right then click on the arrow.
If you clear cookies (or like mine, they are cleared when I close the browser), this will have to be done again.