Has anyone successfully used the screen sharing feature of ichat. I tried it with my father-in-law and we both got the same error, something along the lines of "screen sharing could not start". I know there are settings for screen sharing in system preferences, but I don't know if these need to be enabled or if ichat takes care of everything. We are both on broadband connections, though I am over wifi. The audio and video was fine (albeit grainy).