All those experiencing difficulties in getting their pin or seeing a black screen when u try to view your pin try reinstalling the app and signing in with you BB ID that you have used to register for the beta testing ..... Atleast that's what I found out to be the problem in my case ... I've used a different ID to sign up so it was taking forever to load and when it did out would just display 00000 as my username.... But using the same id as the one used to register for the beta zone solved the issue .. Cheers