Amnesia won't load

[Urkle]

I believe this is a steam issue, as I just installed the steam client
update from yesterday and the game no longer works on my system (e.g.
the system where the mac version was developed).

However, I managed to get it working again.. Here is what I did

• Delete Steam from my Applications folder.
  
• Tell it "NO" when it asks to remove the local data (unless you really want to, you can :-D )
• Go
  to the Library/Application Support/Steam/ folder and delete EVERYTHING
  except for the SteamApps folder (that is where your installed games are)
• Re download steam from steampowered.com
• Reinstall it (drag to Applications folder)
• launch
  steam and wait for it to update. it may take some time and may even
  claim you have no internet just after downloading updates.. just
  re-launch it again.
• Once it finishes updating login, and validate your system (Steams authorization process as it thinks you are on a new system)
• Try
  running amnesia.. It may take a bit as steam resyncs all your games (to
  make sure they are all updated).. But it should run perfectly now.