Thanks a lot for the help, I'm contacting the team.
Anyway, I'm really suprised about the reliability of Steam, differently from other good platforms...
Viewing post in Steam game doesn't start
Steam really isn't as good as what many people would lead you to believe - I personally have a few choice words to say about the Steam "service" (although my reasons for disliking Steam are probably different to yours.)
I do have a Steam acc, but I've not logged into it since mid-2012 after I saw how much of a wreck it really is.