Looks great and seems to have some nice new features however I have one issue that is driving me crazy. My back button closes the app rather than stepping back to the previous screen (menu). For example if I am in my photo gallery and I open a photo, then I push the back button I do not get back to the gallery. The app just closes. Then when I open the app again the pic is still showing and not the gallery. This is also happening on facebook and setting and all other apps. Please help. Thank you Xiaomi MI4 with Miui 7 installed.