Black Wallpaper

Hi guys..

When the Zombie Mode was upload, I started play with more lag and errors!

Well.. I can Loged In and this things.. But when I try to play in some room, when I click "Start" I must wait for 1/3 minutes, because when it's loading the "wallpaper" become BLACK, and I can't do anything!
I only can wait when the image of "loading" appears again. But that's very boring! All the time I need to wait!!!

I tryed to re-install, and other things, but nothing it's working!!

Please help me, I want to play without this problem s:


Thanks.