I am in settings>security>device administrators and any app I select and hit "activate" nothing happens. The only app that is selected as administrator is Android Device Manager, and likewise nothing happens when I hit "deactivate". Can you help? 
I am in settings>security>device administrators and any app I select and hit "activate" nothing happens. The only app that is selected as administrator is Android Device Manager, and likewise nothing happens when I hit "deactivate". Can you help?