here is the example code that works - XFlatGraph is a listS, listS adjacency_list.  Note if I replace the remove edge expression with remove_edge(*iter, _graph) the edge is intermittently not removed

    // Remove edges marked as simualtion only
    scheduled_for_removal.unique();
    for(std::list<XFlatView::edge_descriptor>::iterator iter = scheduled_for_removal.begin();
        iter != scheduled_for_removal.end();
        ++iter)
    {
        remove_edge(source(*iter, graph), target(*iter,graph), graph);
    }