Popups are causing a hang

Users are reporting that a system pop up such as a timer or low memory is causing a hang and crash.

https://udn.unrealengine.com/questions/276642/ios-system-popup-hangs-game.html

1. Set a timer for 1 minute
2. Run Black Jack and wait for the timer to expire
3. Once the timer expires, cancel the pop up and verify it is hung

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