U3DXT Game Center Interface

Hello, I'm using the U3DXT plugin to add Game Center functionality to my game. However, I seem to be having a bit of trouble with the game center interface. I'm able to show it using GameKitXT.ShowGameCenter(), but the interface doesn't close when I press the "Done" button. Is there something I've missed?

A similar thing happens with the multiplayer interface. It pops up when it's supposed to, but once the selections have been made and the game is started it just stays there. All the testing I've done suggests that the multiplayer game is progressing as usual, so I can only assume that it's the interface that's not closing and handing control back to the game.