AIS_InteractiveContext->Display() problem with edge created from section

Hi,
in my application I need to create sections between compound shape (from iges) and a planar face. I'm using OCCT6.2

With some iges all works in the right way. However with complex file i get a "freezing" problem during the edge Ais_InteractiveShape display.

My display code:

Handle(AIS_Shape) ais6 = new AIS_Shape(S3);
if (!ais6.IsNull())
{
myAISContext->SetColor(ais6, color,Standard_False);
myAISContext->SetMaterial(ais6,material,Standard_False);
myAISContext->SetTransparency(ais6,myTransparency,Standard_False); myAISContext->Display(ais6,Standard_False);//Here the code "freeze"
}

Section creation code:
BRepAlgo_Section section(toCut,cutter,Standard_False);
//BRepAlgoAPI_Section always fail...
//BRepAlgoAPI_Section section(toCut,cutter,Standard_False);

section.Approximation(Standard_True);
section.ComputePCurveOn1(Standard_True);
section.Build();
//
if (section.IsDone())
{
sec=section.Shape();
bRet=true;
}

I do:
-ShapeFix_Shape after iges import.
-ShapeFix_Edge after section creation
-Extracting the Handle_Geom_Curve from edge TopoDS_Edge and create a new TopoDS_Edge from that curve

Any hint?