I'm using Unity 4.3.1, and have the game reporting scores and achievements to Game Center with Unity's built-in Social API, and both of those seem to work perfectly fine. However, if you select a leaderboard or achievement, select the "challege friends" option, type something in, then hit "done," the screen disappears with no indication that it's been sent, the friend never gets the challenge, and it's not listed in the "challenges" section of the Game Center UI for either user. Is this a known issue with Unity's social API, or am I doing something wrong somewhere, either in XCode or in Unity?
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