When I open Hugo World the game states that it is waiting for Game Center....and then nothing happens.

So I have tried to enter Game Center which seems to be malfunctioning. When choosing the 'games' section I Can see the app is waiting for something but it does not progress.

I have tried my other games with GC-ids .. And they all work fine ....

Can you help me understand what is wrong with my set up? .... It may have happened in connection to an iOS upgrade, but not sure when the problem started.