External keyboard plugged into xbox not working correctly

Can't enter any commands in creative worlds with cheats enabled any more.  Using external keyboard plugged in USB.  Pressing / brings up the expected screen but you are unable to physically type anything in the textbox.  Pressing enter pops up the text entry dialog which you can enter text into such as "/locate mineshaft" or whatever, but then pressing enter on the keyboard or controller just moves between the pop up dialog and the text box - nothing actually EXECUTES the command.