We are now pushing live a required update for clients and servers. This brings the Killing Floor build number to 1052. This patch fixes the following problem:
Fixed - A case where AI would ignore players
Killing Floor Update 1051 - The Summer Event is Over
You can find the full changelog over in our forums here: http://forums.tripwireinteractive.com/showthread.php?p=1249401
Highlights include bug fixes for Objective mode and the Steamland map, as well as an update to the mutator whitelist.
This is a required update for clients and servers.