I had a BSoD playing TF2 last night, and when I fired it up tonight all my keybinds and server favourites were gone, and whenever I try to join a server from the main list, I get "server not responding". I've rebound my keys, and such, so that is not an immediate problem, but does the server not responding sound like a port issue? I think I have them all forwarded correctly. The router I got from my ISP isn't the most user friendly.
