SD_uFAT - Problem

Hello everyone I have an Arduino Duelminove and a MicroSD Module from libelium.
I have just tried to write in a USD Card by using the SD_uFAT code from http://blushingboy.net/p/SDuFAT/ but I have a problem, I can only save the data if I have the
Arduino IDE?s Serial Monitor open.
Has you see bellow I want to continuous write in the uSD Card when I power supply the sensor board without using the Arduino IDE?s Serial Monitor
Can you help me?

Tanks in Advance.

#include "SDuFAT.h"

// define the pin that powers up the SD card
#define MEM_PW 8

// help string to be sent to the serial port
#define HELP "H help\nL file info\nD delete\nP append string\nW init file and write\nR dump to serial\nA append text\n"

void setup()
{
// on my MicroSD Module the power comes from a digital pin
// I activate it at all times
pinMode(MEM_PW, OUTPUT);
digitalWrite(MEM_PW, HIGH);
// configure the serial port to command the card and read data
Serial.begin(19200);

}

void loop()
{

SD.print("hola.txt","hola caracola\n");
SD.print("hola.txt","Teste\n");
Serial.print("Esta Aberta: \n");

}