I am having problems using iChat. I don't seem to be able to send files across to a fellow iChat user. Both of us end up looking at dialog boxes saying they're waiting for the other user to do something. This is frustrating as, a while ago I was able to send files to a print company using this method. In addition I cannot get AV (using iSight) connection with another iSight/iChat-using Mac user. I can't help thinking it's a Firewall issue. Detailed advice welcome!