Game center doesn't work on imac

I downloaded the W.E.L.D.E.R game and was using it without issues.
I then upgraded to Mountain Lion.
Since then when I start WELDER it stays on the screen for a few seconds then minimizes itself and starts Game Center.
Game Center gives me a signon screen and an empty green screen that I assume is a playing surface.
None of the Me, Friends, Games etc. buttons is active.
I've tried signing on but nothing changes.
I've tried starting Game Center first but nothing changes.
What if anything am I doing wrong?

It sounds like you're seeing the same problem others are discussing here -> Game Center for Mountain Lion not working
That thread has some good ideas, like bringing up Game Center on a iPhone, iPod touch or iPad, so you can agree to the Terms of Use there.
If that doesn't work, try skimming through that thread for other ideas.

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