We have released a Beta update for Portal.
Changes in this update are:
Fixed scenes in games very rarely not playing, preventing forward progress in a level
Fixed advanced chambers not unlocking after finishing the game
Fixed rendering issue when taking damage
Updated in game localization
Fixed background map when a non-standard FOV is selected
Note - This update breaks any save games that were made DURING the beta, if you get an error on load of a save then you will need to manually restart that map, the command to type is shown in the console.