On Android Only. Sometimes when in portrait mode, after switching to landscape the right side of the game gets cut off and just displays as black. The amount displayed seems to be the width of the screen in portrait mode. Also sometimes happens when switching from landscape to portrait. Never experienced this issue prior to Unity 5.
Switching between portrait/landscape sometimes the viewport does not update to the new screen resolution
Well, you can stop auto rotate from occurring. Just go to player prefs, and you should see the options for disabling certain views.