SQLite truble

[tranfuga25s]

I've got problems with this code:

QSqlQuery *cola = new QSqlQuery("SELECT id, pregunta, respuesta, referencia, dificultad, tema FROM preguntas");
if( cola->exec() )
{
   while( cola->next() )
   {
      cout<<"-----------------------------------------------"<<endl;
      cout<<"Numero de pregunta: "<<cola->value(0).toInt()<<endl;
      cout<<"Tema:"               <<cola->value(5).toInt()<<endl;
      cout<<"Dificultad:"         <<cola->value(4).toInt()<<endl;
      cout<<"Texto: "             <<cola->value(1).toString()<<endl;
      cout<<"Respuesta:"          <<cola->value(2).toString()<<endl;
      cout<<"Referencia:"         <<cola->value(3).toString()<<endl;
   }
   delete(cola);
   return;
}

QSqlQuery *cola = new QSqlQuery("SELECT id, pregunta, respuesta, referencia, dificultad, tema FROM preguntas");
if( cola->exec() )
{
   while( cola->next() )
   {
      cout<<"-----------------------------------------------"<<endl;
      cout<<"Numero de pregunta: "<<cola->value(0).toInt()<<endl;
      cout<<"Tema:"               <<cola->value(5).toInt()<<endl;
      cout<<"Dificultad:"         <<cola->value(4).toInt()<<endl;
      cout<<"Texto: "             <<cola->value(1).toString()<<endl;
      cout<<"Respuesta:"          <<cola->value(2).toString()<<endl;
      cout<<"Referencia:"         <<cola->value(3).toString()<<endl;
   }
   delete(cola);
   return;
}

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When run it, it's stops al the first .toString() output. If the last 3 outputs are not there the cycle work fine... Any Idea????...
Using Qt 3 with linux
Thanks