Till,
without seeing the code in question, it's hard to say what's happening. 
However, does it make a difference if you use reordering *and* 
Triangulation::create_triangulation (not the _compatibility version)? Or 
do you mean here...

> boundary_vertices,BEM_cells, subcelldata); // (empty subcelldata object)
> (I've tried without reordering and .create_triangulation(...) first.)

...that you've tried all four permutations and they all don't work?

My best guess is that the triangulation is already invalid. One way to test 
this is to create a surface (dim,dim-1) triangulation from your once 
refined cube, refine the surface triangulation a couple of times, and 
output it to a ucd or vtk file. If you visualize this, does it look 
alright?

Best
 W.

-------------------------------------------------------------------------
Wolfgang Bangerth                email:            [email protected]
                                 www: http://www.math.tamu.edu/~bangerth/

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