>> Ok, I have found the problem...
>> ComputeHilbertKeys is calculating the same node_key for different nodes.
>> This is a mess because the mesh has no tears, even for higher h
>> refinement levels.
>> 
>> Any idea? I don't know how LibHilbert works.
> 
> I'm afraid this is up to Ben; it's a library he added to help with
> parallel I/O, I believe.


Do you have a simple code you can send where I can try to repeat the
problem?

I am not anticipating duplicate Hilbert keys unless the nodes really are
identical to within double precision.  Have you seen which nodes are
actually producing the identical hilbert keys?

This will be the first thing I check.  The question is have duplicate nodes
appeared from some other reason and the hiblert indexing is just the first
thing to detect the error, or if two geometrically distinct nodes really are
producing the same hilbert key.

In any case I'm certainly interested in the issue and hope to fix it.

Thanks.

-Ben


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