|Message: Re: Infinite Loop in G4SubtractionSolid::DistanceToIn()||Not Logged In (login)|
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it turned out finally that the problem was not due to the geometry, but due to a missing protection in G4LowEPComptonModel.cc, which made an std::acos(..) function go crazy about a value being slightly larger than "1.00000000....".
A fix has been provided by Jeremy Brown from the GEANT4 collaboration, which should close the issue.
Thanks to everybody who contributed in the solution to this problem,