IChat Audio and Video not working correctly...

Hi.
I recently upgraded to Snow Leopard. Before upgrading, I was able to video chat with little to no problem with family over iChat. I just tried it again today for the first time since upgrading to Snow Leopard and the audio is barely working (can only make out every few words, if that), and the video is extremely distorted to where you can sometimes not even tell there are people there. It gets all pixelated and weird. I tried doing the chat with Google Talk and then again with Skype, and had just as many problems with those. My family is using a Mac with an older OS, and they can see and hear me perfectly fine. I'm not sure if the problem is with my computer or with theirs, or if it's just a communication problem, but any ideas would be really helpful. Thanks!

After iChat developed missing audio and video pixellation problem post Snow Leopard installation at my mother-in-law's machine (and ours), I tried the usual decrease the bandwidth fix to no avail.
The solution that actually fixed the probem was to turn off port forwarding protocol on her Time Capsule and our Airport Extreme. Things are now working smoothly even at 500 kbps settings on both ends.
An interesting aside... Turning off port forwarding for ssh to her machine doesn't kill the ssh port tunnel from the outside LAN to her mac. It looks like iChat and the Time Capsule keep an incoming ssh tunnel open even if you have disabled port forwarding on the Time Capsule. I suspect this "secret" opening of ports is the magic of why iChat and screen sharing have been so much easier to set up when a Mac is behind an Apple router. 3rd party routers need ports manually forwarded to the Mac. Apple routers just worked ---- and it looks like Apple does it by invisibly opening ports on their routers when a Mac runs iChat.
Pretty nifty, but also silently opens a security hole that you may THINK you closed. SL seems to trip up over this arrangement when you also turn on Port Mapping Protocol and manually assign ports to forward.
At any rate, it wasn't the data rate, it was a new bad interaction between the Apple Router's Port Mapping Protocol and iChat 5. Turn off PMP on the airport and all becomes well once more.

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