I use AIM on iChat and whenever I try to start or accept a video or audio chat invitation, it doesn't work. When I send them an invite and they accept, an alert pops up on my screen saying "You did not receive a response from _______" and I have the option of sending the error report to Apple. When they send me the invite, same thing happens to me. This isn't isolated to Mac-to-PC either. Same thing occurs when I want to talk to somebody on their Mac from mine. I hope someone can help because I've really reached the point of frustration mad:), as you can tell from the title. Thanks.