Multiplayer Log in problems

[drob8785]

I've been having trouble joining Multiplayer games for about a week now. I have the 1.03 patch, but whenever I try to enter in a game- It doesn't load, and kicks me back to the main menu, saying that I'm missing the level. It also kicks me back to the main menu with the message: "Invalid Gamefolder" However when I create my own MP game (with bots and such) the levels work perfect.

thanks