leonardo + SD shield works just one time!

Development Tools IDE 1.x
1

Hi , i have a big problem with my new Leonardo
im triying to use this SD shield

http://www.olimex.cl/product_info.php?products_id=698&product__name=Arduino_microSD_Shield

with this changes

and this code

#include <SPI.h>
#include <SD.h>

File myFile;
const int chipSelect = 8; //la microsd shield de MCI viene con el 8.


void setup ()
{
  Serial.begin(9600);
  //while (!Serial); // wait for serial port to connect. Needed for Leonardo only. tarjeta sd
  pinMode(SS, OUTPUT);
    
  if (!SD.begin(8, 11, 12, 13))
  {
    Serial.println("Tu tarjeta no esta, o algo se desoldo :[");
  }
  else
  {
    Serial.println("La tarjeta esta OK :]");
    myFile = SD.open("test.txt", FILE_WRITE);
    if(!myFile)
    {
      Serial.print("no puedo abrir el archivo :[");
    }
    else
    {
      myFile.println("Bienvenido a la estacion metereologica 0.2");
      myFile.close();
    } 
  }
}
void loop ()
{
  if(SD.begin(8, 11, 12, 13))
  {    
    myFile = SD.open("TEST.txt", FILE_WRITE);
    Serial.println("We did it!");
    myFile.close();
  }
  else
  {
    Serial.println("No busques donde no encontraras! no hay tarjeta :]");
  }
  
  delay(3000);
}

but i can go inside the if (if(SD.begin(8, 11, 12, 13)) , just one time ( i belive that some thinks is not working again after that but im not shure what can be)
anyone now if Leonardo change it in the last 3 months?

thanks in any case!