Issue in displaying a specific leader board

Here is my configuration :

I activated GameCenter with 3 leaders boards in iTunes connect.

The Default leader board has got id ‘EASY’ and the others have got id ‘MEDIUM’ and ‘HARD’

I have 3 buttons each displaying either leader board :

button1 : gameNetwork.show (“leaderboards”, {leaderboard = {category=“EASY”, timeScope=“AllTime”}})

button2 : gameNetwork.show (“leaderboards”, {leaderboard = {category=“MEDIUM”, timeScope=“AllTime”}})

button3 : gameNetwork.show (“leaderboards”, {leaderboard = {category=“HARD”, timeScope=“AllTime”}})

I have built my app with the latest public release 2014.2189 and installed the app on an iPad os version 5.1 and an iPod os version 6.

On the iPad with os version 5.1, this works fine. The correct leader board is displayed every time I touch a button.

However, on the iPod with version 6, sometimes the correct leader board is displayed. But most of the time, it is the default leader board that is displayed when I touch button2 or button3.

I built the sample game network code coming with the SDK, and the same thing happens.

Can anybody confirm this?