Hi, I had some problems serializing/deserializing a multi_index container. I've tried a work around of copying the container into a vector and serializing/deserializing this (which works). Does anyone know the conditions under which serialization of multi_index containers do not work? My guess is my operator< may not satisfy the requirements although it has stood up to all the testing I have been able to do so far. I am using VS2005 with boost 1_33_1. FYI I'm getting an archive exception from this code in ordered_index.hpp: void rearranger(node_type* position,node_type *x) { node_type* before; if(!position){ before=position=lower_bound(key(x->value)).get_node(); node_type::decrement(before); } else{ before=position; node_type::increment(position); } if(position!=x){ /* check the rearrangement is consistent */ if(!in_place(x->value,position,Category())){ throw_exception( archive::archive_exception( archive::archive_exception::other_exception)); } ordered_index_node_impl::rebalance_for_erase( x->impl(),header()->parent(),header()->left(),header()->right()); ordered_index_node_impl::restore( x->impl(),before->impl(),position->impl(),header()->impl()); } } Thanks, John.