From Chris Hanson, "  Adds missing copy for _bbox member variable to copy constructor:

LightPointNode::LightPointNode(const LightPointNode& lpn,const osg::CopyOp& copyop):
    osg::Node(lpn,copyop),
    _bbox(lpn._bbox),
    _lightPointList(lpn._lightPointList),
    _minPixelSize(lpn._minPixelSize),
    _maxPixelSize(lpn._maxPixelSize),
    _maxVisibleDistance2(lpn._maxVisibleDistance2),
    _lightSystem(lpn._lightSystem),
    _pointSprites(lpn._pointSprites)
{
}


  Lacking this causes _bbox to be uninitialized after LOD changes when paged databases refer to shared subgraphs.

"