I have a new Extreme base station, and with it iChat A/V doesn't work anymore. I thought it was supposed to take care if itself with PMP (Port Mapping Protocol), but everytime the connection fails with the same I "did not respond" error (although I can connect to appleutest01 and hear/see successfully). If I revert to my old setup, iChat connects just fine. What can I try, please, any suggestions anyone?