I'm unable to show the high score of friends in my Facebook app. The request for the highscore list through the FB plugin only returns the player's own score.
While the FB highscore function appears to work for older users on older apps, it does not work for new apps or for new users of older apps.
The issue seems to be that when a new user of a C2 FB-app logs in for the first time, the app is not granted the user_friends permission from Facebook (This permission was granted to C2 apps previously).
I read that Facebook recently tightened up their apps-permissions policy. Perhaps permissions that were previously given by default must now be explicitly requested? In that case, maybe the FB-plugin must be updated for the highscore function to work. Just my guess.
Is there someone who is able to use the FB highscore function for new apps or for new users on olders apps?