I have only been on varac a short while but scratching my head over something.
A ham friend of mine about 50 miles from me just loaded the software also. He can call CQ get replies he can have people call him and he can chat and he can call other people and connect.
The same holds true with my station. I can call CQ and get replies, I can connect with any other station, but for some reason I cannot connect to him and he is unable to connect to me. This is with S7 signals between us and tried on different bands.
We both run SDR, here is on a Anan 7000 and i am on a SunSdr2.