i have downloaded the latest version of aim and ichat on my macbook and i am trying to ichat with my sister. she also has a mac and we both have aim accounts and built in cameras. when i try to add her as a buddy, she will show up on my buddy list for about 5 seconds and then dissapear. this does not happen with another one of my buddies... can anyone help me figure out why she is not showing up and not allowing me to video chat?? thanls