A Steam client update is now available. To apply the update, click the File menu inside of Steam and then select "Check for Steam Client Updates...". The specific changes include:

Steam Client

• Fixed reconnect issues with chat rooms
  
• Fixed clients in chat rooms getting into 'ghost chats' if they disconnect and reconnect from the Steam servers
  
• Fixed client hang if the server browser window was closed while the "Add server" window was open
  
• Fixed the name of mods being played not always showing to friends
  
• Fixed switching between fullscreen and windowed mode in a DX7 game with the overlay enabled
  
• Fixed texture corruption in OpenGL games with the overlay enabled
  
• Steamworks: added more logging & warning info for the networking API