I tried on several physical devices including iphone 5 and ipad 2 but only ipad 2 with retina display have this problem.
In certain cases when i add layer to the scene it's like application gets paused. When i minize app and start again the freeze is gone but if i add another
layer the game freezes again. When the game freeze and there is visible facebook button it can be clicked but the whole application is unresponsive except the facebook buttons. We recently went from CocosSharp PCL 1.6.2 to CocosSharp 1.7.1. We didn't encountered this problem on previous version of library. We upgraded because we needed to add some facebook buttons to applications, and now we are using the CCGameView.
Thanks for help.