The Left 4 Dead Blog has word that PC users voted for Survival Versus as this week's encore mutation for Left 4 Dead 2, while Xbox 360 users have opted for Four Swordsmen of the Apocalypse. Steam News has word on the new patch for the zombie shooter sequel adding the encore mutation as well as adding a setup timer to Versus Survival and fixes an exploit that dropped players from dedicated servers. A subsequent patch is also now available, which fixes a bug in Versus-Survival where a team could get 5 survivors.