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Unfortunatly there is a fine wire Grid below the surface of the glass, the grid detects where you are touching on the screen, with the glass being broken, the grid is broken, which will cause dead spots or regions on the touch screen. You will have to replace the Touch screen or the unit which ever is most cost effective.
It actually sounds like you don't have your parking break wire (light green wire on wireing harness) grounded. I have an 06 F150 and the same thing happened to me when I instaled it. I had no address search and some other functions didn't work as well. Try to locate the light green wire and ground that to anything metal. Hope this helps, the install manual isn't very good at describing this.
Is the screen cracked? Just a small crack can cause problems. When the screen is cracked and you touch it, it touch's some where else on the screen. I cracked mine, and I just changed it. It's pretty easy, all you need is a small phillips screw driver. Good luck!