I just got Sightspeed 6.0, my Mac is version 10.4.8. Unfortunately, it won't call anyone on my contact list. It says I need to turn off my firewall or it gives me an error 408 (try as I might, I cannot find what an error 408 is), and I have my firewall off.

I tried calling the Fish Tank and myself, and it will give me those error messages. I've tried deleting then reinstalling it to no avail, restarting, running disk utility.