There is a new Left 4 Dead 2 update on Steam. As usual the updates will be applied automatically when the Steam client is restarted. Changes are as follows:

* Fixed case where game failed to launch in certain machine configurations.

* Fixed bug where a burning witch could get into a state where she's invincible.

* Fixed bug where bots would not shoot at Jockeys and Chargers while approaching to save a team-mate.