I too am facing the same issue - My messages return to me. Also, the supposed recipient doesnt get any!
Here is my configuration if it may help.
Service is Google Talk.
JID - <google.username>@gmail.com
password - google account password
Resource - Nokia N9
Server - talk.google.com
Port - 5222

I also tried port 443 as recommended by Google. But it gives me "socket error".

So basically this issue cripples the whole app for me.
Awesome UI, btw! I really wish to use the app if the issue gets fixed. :-)