Updates to Half-Life 2 have been released. The updates will be applied automatically when your Steam client is restarted. The major changes include:
Fix getting stuck after doing level transition from d2_prison_08 to d3_c17_01, the Nova Prospekt end battle
If you have a save game that causes you to be stuck in the teleporter with Alyx after this level transition you will need to manually restart this level to continue. To do that enable the developer console and type "map d3_c17_01" to load into this map.