My SM -t807a keyboard stopped working, how can I fix this?

[AC Question]

cleared cache - tried to force stop the keyboard, no-go, keyboard default is checked but greyed out. any ideas

 

[B. Diddy]

Welcome to Android Central! Does the keyboard just never pop up? Or does it pop up, but the keys don't work? Have you tried any other keyboards like Google Keyboard or Swiftkey?