Which canon digicam are you using -- do you mean you're using a digital (still) camera or do you have a canon webcam or FW DV cam? When you click on your own video icon, to see your own video locally, is it smooth or jerky? The two major possibilities are that for some reason your cam is not sending your computer clean video (which would mean that even when you do a local view, it would be jerky) or that you have a one-way bottleneck in your sending internet connection.