In contrast to TeeChart 2012, multi-line axis labels are not supported anymore in TeeChart 2014, May, 12, 2014. Only the first line is used for display of the axis label (see TeeEngine.pas, function TChartAxisTitle.GetCaption).
Even if TChartAxisTitle.GetCaption would return all lines, TCustomTextShape.DoDraw, which actually draws the label, would not draw the lines correctly, if the angle is 90.

The code below reproduce the problem: 
procedure TForm1.FormCreate(Sender: TObject);
begin
  Chart1.MarginBottom := 10;
  Chart1.MarginLeft := 5;
  Chart1.Axes[0].Title.Angle := 0;
  Chart1.Axes[0].Title.Caption := 'Line 1'#13'Line 2'#13'Line 3';
  Chart1.Axes[2].Title.Angle := 90;
  Chart1.Axes[2].Title.Caption := 'Line 1'#13'Line 2'#13'Line 3';
end;