05-30-2013 09:33 AM
With the above method screenshot works for me on OS 7.1, I have just tested it with the fb and twitter apps too.
I've prepared my build with SDK 5.0 and signed my application with the following signer IDs: RRT, RBB, RCR, RCC.
Maybe you just need to modify any minor thing in your code and make a clean, new build. Very rarely happened to me that a funny error came up and a new, clean build solved it.
I would try to reproduce this with your app in a 7.1 Simulator with security enabled. If the problem persists, there should be something with the app. If works correctly then there should a problem with the device. I am not aware of any IT Policy or other privacy setting which would prevent screenshots only on certain applications.
06-13-2013 06:08 AM
06-13-2013 06:49 AM