Offline mode fails to start for some users, causes unkown yet
Steam users worldwide are getting more than they expected this Christmas, courtesy of Valve.Increasingly annoyed reports are piling up on a Steam Community thread about an ominous "No Connection" error, pictured above.
Depending on your luck, this means you can either start the client in offline mode and play only single-player games with anything related to the Steamworks cloud features disabled, or you cannot start Steam at all and consequently access anything in your library.
However, store related functionality seems unaffected, in case this blunder made you feel like purchasing some more games you may or may not be able to play this holiday season.
We'll keep you posted as the situation develops.
UPDATE: It looks like the issue has been resolved. Kudos to Valve for acting rather quick on this one.