Updates to Left 4 Dead have been released. The updates will be applied automatically when your Steam client is restarted. The specific changes include:

Left 4 Dead

• Fix for alt-tab crash in certain cases

Source Updates to Left 4 Dead have been released. The updates will be applied automatically when your Steam client is restarted. The specific changes include:

Left 4 Dead

• Fix for alt-tab crash in certain cases

Source