Sorry, all - we know that as of yesterday, a lot of new purchasers are seeing issues with a grey screen on startup. As of today, everyone is now seeing a 'Can't Connect' message for the Get New Stories button - which is a bigger problem, because Get New Stories was a workaround for the first issue.
We put out a patch yesterday, and also did some server migration work yesterday / today - this has caused two separate issues which are colliding in a nasty way.
We are working to fix this right now. Really sorry for the trouble. We're happy for you to request refunds from Steam in the meantime (even if you repurchase the game later).