[marcoszorrilla]

Por qué no cierras el formulario que contiene el Objeto QuickRep:

Código Delphi [-]
  public
    { Public declarations }
    Cerrar:Boolean;
  end;

var
  Form1: TForm1;

implementation

{$R *.DFM}

procedure TForm1.Button1Click(Sender: TObject);
begin
QuickRep1.PreviewModal;
end;

procedure TForm1.FormActivate(Sender: TObject);
begin
Cerrar:=True;
end;

procedure TForm1.QuickRep1BeforePrint(Sender: TCustomQuickRep;
  var PrintReport: Boolean);
begin
If Cerrar = True then
form1.Close;
end;

procedure TForm1.FormClose(Sender: TObject; var Action: TCloseAction);
begin
Application.ProcessMessages;
Action:=CaFree;
end;

Un Saludo.