New iSight - Why did iChat AV Work 1st Time but Not Since?

I recently bought an iSight to use with my sister in Minnesota (I'm in Canada, eh). It worked perfectly - the first time I used it after installation. I haven't been able to create a connection with my sister since.
Between the first connection and my second connection attempt, my sister installed a Linksys router and turned on her Mac firewall. She is still able to use iChat for video chats with other people without a problem. Nothing has changed at my end (I have a Linksys router, too, and my Mac firewall has always been on). Sadly, I don't have anyone else with whom to test my connection, but as I said, nothing has changed on my system.
The error message accuses the invited party of failing to respond. This is simply not true. The invited party always "Accepts". (We've alternated initiator and responder roles.)
I've reviewed several support documents including the one about using iChat with an NAT router, although I don't think this is the problem. I opened the ports in my router and after this I was still unable to connect, but for a different reason - "insufficient bandwidth". Restoring my router to the previous configuration (i.e., no special adjustments to ports) restored the original error message ("failed to respond").
I checked my Quicktime and various system preferences and they were correct. This isn't a surprise since iChat did work with my system the one time.
I'm reluctant to keep fiddling with various settings when my original setup actually worked - once.
Thank you for pondering my problem!
James

Hi.
I apologize for not noting the model of router. I'm using a Linksys WRT54G wireless, but my eMac is hooked up with a wire (the wireless is for another Mac). I'm not sure what my sister is using but I will find out.
I agree that it looks like all this is her fault, what with the router and the firewall and the what-not, but I'm mystified by the fact that it worked the first time.
I've printed off some of the other threads and I will try a few other things.
Thanks you very much!

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