I'm not sure but if you see full screen but the PC end cannot, could it be that the PC end has a setting incorrectly set or does not have a good enough Internet connection to support large expanses of Video real estate?
Full screen video, good video, eats up bandwidth at a terrific rate and requires a fair amount of processor power. What is full screen? 15", 17" 22" or even the 30"
Maybe the problem lies at the receiving end.
Ever consider getting your family to buy a Mac?
I have an emac 10.3.9 since I have ichat ican see full screen but since my family has PC and have to chat with an AIM (aol) account they can onlly see me on a small screen, does anybody know of something or some way we could both chat in full screen ? There has to be something out there