PiFaceDigital 2 board seems not to respond to .init

Hi,

I have some written some code for a Pi with a PiFaceDigital 2 card which is a reaction timer game.

The programme starts in a menu with 2 options - option 1 is to play the game, option 2 is to quit. Once in game play, the screen clears, and the programme waits for an input from one of the four buttons on the PifaceDigital. When someone presses a button, the programme reports which button was pressed, and the time elapsed since starting the game.

All works well, except if a button is pressed on the PiFace whilst in the menu section of the game, as soon as gameplay starts, the programme immediatly reports that a button has been pressed.

Whilst a sensible answer is "don;t press any buttons then!", that's not quite possible, as the game is based on external sensors, and they will be reset during this time.

I have used the .init command to reset the board, but it doesn't seem to work.

Code below....any ideas?

import pifacedigitalio
import time
import os

pfd = pifacedigitalio.PiFaceDigital()

def print_flag(event):
    print ("The winner is station ",event.pin_num + 1)
    end = time.time()
    print end - start
    pfd.leds[1].turn_on()
    time.sleep(2)
    pfd.leds[1].turn_off()
    time.sleep(1)
    pfd.leds[1].turn_on()
    time.sleep(2)
    pfd.leds[1].turn_off()
    time.sleep(1)
    pfd.leds[1].turn_on()
    time.sleep(2)
    pfd.leds[1].turn_off()
    time.sleep(1)
    global quit
    quit = True

ans=True
while ans:
    os.system('clear')
    quit = False
    print("""
    1. Play game
    2. Quit
    """)
    ans=raw_input("Please select...")
    if ans=="1":
        pd = pifacedigitalio.PiFaceDigital()
        os.system('clear')
        print("The game has begun...")
        print("")
        pd.deinit_board
        pifacedigitalio.init()

        listener = pifacedigitalio.InputEventListener(chip=pd)
        start=time.time()
        
        # set up listeners for all buttons
        listener.register(0, pifacedigitalio.IODIR_ON, print_flag)
        listener.register(1, pifacedigitalio.IODIR_ON, print_flag)
        listener.register(2, pifacedigitalio.IODIR_ON, print_flag)
        listener.register(3, pifacedigitalio.IODIR_ON, print_flag)
        
        # Start listening for events.  This spawns a new thread.
        listener.activate() 
        
        # Hang around and wait for a button press
        while not quit:
            time.sleep(1)
        listener.deactivate()
        pd.deinit_board
    elif ans=="2":
        break
    else:
        print ("Not a valid choice, please try again")
        time.sleep(1)