[Gmsh] problem with surface displaying

[Roman Przylucki]

Dear Sir.
I have a problem with a face visualization in Gmsh.

After extruding of non plane surface (cone surface) it is imposible to 
show surfaces and surface's numbers in Gmsh.

But except that, model seems to be correct also meshing is correct.

Do you know this problem?
Is it impossible to extrude non plane (cone) surfaces?

Unfortunately I'm trying  to prepare a complicated geometry, and I 
divide the problem into several files.

The main file to open in Gmsh is: "t1.geo"
Probem with extrusion is in the file: "t1_2_palce_wsad.geo" (sorry for 
such name) in line 30.


Other files contain:
t1_1_dno2.geo : begining of geometry,
t1.par : geometrical parameters,
t1.m : mesh parameters,
t1.v_s : physical volumes and surfaces definition

Gmsh version: 3.0.2, 2017 05 13
FLTK version: 1.3.4; PETSc version 3.7.5; OCC version: 7.1.0; MED 
version: 3.2.0
Operating system: Windows 8.1 Pro 64 Polish language version

Sincerely,
  and with request for help
Roman Przylucki

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Include "t1.par";
Include "t1_2_palce_wsad.geo";


//nowy model starego tygla 15.05.2017

//2D mesh Mesh.Algorithm
//2D mesh algorithm (1=MeshAdapt, 2=Automatic, 5=Delaunay, 6=Frontal, 7=BAMG, 8=DelQuad)
    
//Mesh.Algorithm = 2;

//3D mesh algorithm (1=Delaunay, 2=New Delaunay, 4=Frontal, 5=Frontal Delaunay, 6=Frontal Hex, 7=MMG3D, 9=R-tree)

Mesh.Algorithm3D = 2;     //nowy delaunay dziala

//Mesh.Algorithm3D = 4;     //frontal

//+
Coherence;
//+
Coherence;
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