They spoke to me yesterday about their group policy. It is only in place to make sure that certain ports are ALLOWED and that's it. They still accessed my computer remotely and poked around to make sure that everything was setup correctly in order for the software to work. From their point of view, everything should be working.
We are just very limited in what we can do when the prime suspect is the network itself.
If there is a VPN connection involved, kill it temporarily.
If you have multiple NICs installed on either PC, disable them.
If either leg is over wireless, please try ethernet only.
Ensure that both PCs are not on a 'Public' network:
For added peace of mind, disable any an all Windows / AV firewalls on each box (domain, private, public):
Instead of the hostname, add the Secondary by it's (same subnet as Primary) IP:
Stardock Support Manager