Crashes everytime i try joining any official server.

[THE PONI]

I can play in the public testing environment servers but when i try joining an official server the game loads half way and i get the windows box saying infestion.exe has stopped working and it closes. I was able to play before but havent played in months and now this is happening.

My pc specs are:
8 gb ram ddr3
radeon 6870
amd 965 phenom ii