Invalid Data

I'm a huge fan of NS. Been playing since 05 or something. I just booted it up and I can't join a server without getting a message saying "invalid data." I've deleted my cache, mods, verified game cache, and even deleted/reinstalled the game. Nothing is working. I'm getting very frustrated. I've had NS2 since launch and haven't had any issues like this until now, and nothing I'm Googling is a valid solution.

Asus Crosshair IV Formula
Phenom II X6 1100T
8GB G.Skill 1600
Radeon HD 7870 GHz (Catalyst 13.11)