Can you provide us with some extra information?
When you right-click on the cam2cam area you should see a menu. click on the 'settings' option.
You should now see the Adobe Flash Player Settings Dialog. Under the 'privacy' tab, make sure you have the "allow" button chosen and the "remember" box checked.
Change to the microphone tab (the icon looks like a microphone). You should see a drop-down menu with all your available audio devices. Make sure the proper microphone is selected and that the volume slider isn't all the way at the bottom.
If messing with these settings didn't do anything, let me know what microphone device you're using and I'll see if i can duplicate on our end.
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