"Okay last couple of weekends have had no issues joining each other using gamespy now that it has been removed we are back to the same problem, not able to find each other no matter which one of us hosts the game. [...]"

-Shotgundb8

We are encountering the same problem. It worked well until the update to ver. 1.22.125300. Before that we could play, finding the servers via the filter function. Even though we had to change from STEAM to GameSpy (after the update before). Since the update (1.22.125300) it is no longer possible to switch between these options. We also tried to use the Steam invitations, but they didn't work ever since I bought the game.