Cannot see new leaderboard & achievements Mac OSX

As a Mac user, this came as a bit of a surprise. I wanted to update my Mac OSX app to get a new leaderboard and few more enhancements to it. From the start, I have those but I also wanted additional functions. Following the update, I cannot see new leaderboard & achievements at the Game Center dialog (only old ones are there). I get this error message when I try to unlock an achievement:

[Error] No platform string for specified GKGamePlatform value (0), defaulting to iOS.

Any clues to what went wrong?

Hey there!
Check this link
It shows different situations about it and how to fix them