Resent because the webmail eats endlines          

          I am already using the last stable version (gmsh 2.11.0)
I have investigated a little bit more and I have seen that the msh file 
contains a few lines as the followings
2 4 259
Affine -0.9999999999999994 1.110223024625157e-16 0 0 -1.110223024625157e-16 
-0.9999999999999994 0 0 0 0 1 0 0 0 0 1
64
14624 23986
-1 23987
-1 23990
The problem is related with the -1 value associated with the tags of some slave 
vertices.
I have used GDB with a breackpoint  inside of the function 
writeMSHPeriodicNodes  (GModelIO_MSH.cpp line 574)
I have also used a break point condition  (v1->getIndex() < 0) in order to spot 
the problematic data.
So I have discovered that the slave vertex is good (for what concerns the 
geometrical position) but has an index= -1.

The problem now is that I do not know where the wrong index was generated.
The slave vertex was created inside of the copyMesh(...) function:
  MVertex *vt =new MFaceVertex ...
But this function seems not to be the responsible for the index value of -1 
(the MFaceVertex constructor sets that value to 0).

And why most of the slave indices were properly renumbered with the exeption of 
those associated with face 4 (having master face=259) and a few others ?
  
>I don't think so: the actual mesh is indeed incomplete. The problem is most 
>probably in the generation of the slave mesh. 
Quite a bit of work has been going on on periodic meshes in recent releases: I 
would try with the latest stable release to see if the problem >persists.


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