Netmeeting hangs

Lately my Netmeeting (v.3.01) hangs after a couple minutes of conferencing over the internet with a dial up connection. I can use all other programs but Netmeeting is stuck and not even task manager will end it! I have to reboot to get out of Netmeeting. Any Suggestions? This is a dual boot machine and it happens in both W2K and Win ME. I havent installed any one piece of software to both OS’s at the same time so I don’t think it’s something i’ve installed. It used to work just fine for months and now this. HELP!