Whenever I join a server, it says Connecting and then it pops up a screen with Brown and Green Squares and says Error, and then turns into a black screen. How do I fix this?

Broken iwd's. When you get the error again alt+tab out and you will see the error dialog box.

yes i see the error box, but how do i fix it?

yes i see the error box, but how do i fix it?

What does the error say?

it just says Error

missing maps I bet. make sure you download all dlc from new store.