Leopard iChat 4 Issues - Breaks Apple Extreme Base Station Connection

I recently upgraded to Leopard (now running 10.5.1) and I'm having major issues with iChat 4. iChat worked fine using Tiger. I can successfully audio chat, screen share, text and use all other functionality of iChat, but video chatting always locks up.
When starting a video chat, it usually lasts anywhere from 2 to 12 seconds and then locks completely. Not only does the chat stop working, but my Airport Extreme Base Station stops working as well. I lose all internet connectivity. I still get the green light like everything is fine with the router, but my network connection is completely broken. I can't even log into the base station using the airport utility. I have to unplug it to get it working again. In iChat I always get the error that says something like "there was no traffic for 10 seconds".
I have tried changing bandwidth settings in iChat and Quicktime. I have tried deleting cache files. I have tried deleting plist files and nothing corrects the issue.
I see that other folks have had similar problems, but noone else is using Airport Base Station as far as I can tell and noone seems to have issues the their router not working after iChat locks.
When I upgraded to Leopard, I did a clean install and then imported settings and files from tiger on a backup drive. Any help would be appreciated!

Hi,
I would make sure the Mac Firewall is On and iChat allowed.
iChatAgent should appear later.
If it was set before the 10.5.1 update I would set it to Allow All then reset the Specific apps after deleting the ones there already.
9:50 PM Thursday; December 6, 2007

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