http://iscoresports.com/

This weekend, I was scoring a game when suddenly a walked batter would not "walk" in the application. It properly reported "Ball Four" and showed for B symbols in the pitch count, but the batter never left home plate in the display. Needless to say, that ended my scorekeeping.

I was only able to recover this by uninstalling the application and re-importing all of my data.

I'm running on an Android Tablet and keep it updated regularly.
Anyone see this before?

It sounds like you either set the number of balls for a walk to something more than 4, or you turned on the Coach Pitch on walk option. Both are documented in the user manual (footer of this message has the link), and you can also see these option by tapping the Settings icon in the bottom right of the main scoring screen.