Webcam won't work for Tokbox or Meebo?

My webcam works webcamming on aim one on one but sometimes I want to webcam in a group using Tokbox or Meebo. I use to be able to but recently it says "TokBox was unable to connect to this video chat. Please try starting a new chat." I tried starting a new chat and refreshing the page, but the same message keeps on reappearing. I don't know what I can do to make it work again? All answers are appreciated, thanks! :)