CGAL users discussion list

I am having a problem operating on a union of balls mesh.  Code compiles and 
runs without errors, but it seems when the number of vertices goes over about 
2 million, I get a run-time error if I either a)try to output the mesh to an 
OFF or b) try to simplify the mesh using the mesh simplification routine.  
Code works fine when there is under 2 million vertices.  Here are my 
constructors:

///////////////////////
typedef CGAL::Exact_predicates_inexact_constructions_kernel K;
typedef CGAL::Skin_surface_traits_3<K>                      Traits;
typedef CGAL::Union_of_balls_3<Traits>                      Union_of_balls_3;
typedef Union_of_balls_3::Weighted_point                    Weighted_point;
typedef Weighted_point::Point                               Bare_point;
typedef CGAL::Polyhedron_3<K,
  CGAL::Skin_surface_polyhedral_items_3<Union_of_balls_3> >   Polyhedron;

namespace SMS = CGAL::Surface_mesh_simplification ;

Polyhedron p;
//////////////////////

after adding the balls, here is my code to create the mesh and simplify, just 
as with the related example from the manual:

///////////////////////
  Union_of_balls_3 union_of_balls(ball_set.begin(), ball_set.end(), Traits(), 
true);
  CGAL::mesh_union_of_balls_3(union_of_balls, p);

  SMS::Count_stop_predicate<Polyhedron> stop(ball_set.size());
     
  // This the actual call to the simplification algorithm.
  // The surface and stop conditions are mandatory arguments.
  // The index maps are needed because the vertices and edges
  // of this surface lack an "id()" field.
  int r = SMS::edge_collapse
            (p
            ,stop
            ,CGAL::vertex_index_map(boost::get(CGAL::vertex_external_index, 
p)) 
                  .edge_index_map  (boost::get(CGAL::edge_external_index  , 
p)) 
            );

        std::ofstream out("output.off");
        out << p;
/////////////////////////

Is there some hard limit to the number of vertices that can be processed?  Am 
I using the wrong kernel?  Any help is appreciated.

BM