Hi, I have a problem with Mutable queue. I'm trying to store edge descriptors there, but sometimes (!) my program fails with segmentation fault at mutable_queue.hpp:94 when I'm trying to push an edge_descriptor into the queue. There is a way how I declare and create the queue (entire code is to long to include): typedef typename property_traits<CostMap>::value_type C; typedef indirect_cmp<CostMap, CompareFunction> IndirectCmp; IndirectCmp icmp(cost, compare); typedef mutable_queue<Edge, std::vector<Edge>, IndirectCmp, IndexMap> MutableQueue; MutableQueue Q(num_edges(g), icmp, index_map); where g is VertexAndEdgeListGraph, compare is std::less<C>(), cost is weight_map(get(&Edge::cost, graph)), index_map is property_map<graph_t, edge_index_t Edge::*>::type edge_index = get(&Edge::index, graph) My program fails here: Q.push(s); where Q is declared above s is typename graph_traits<IncidenceGraph>::edge_descriptor s I guess, something is wrong with the Index Map. Please, help me! Thanks in advance, Anton.