Using Boost 1.34.1 with VC++ 7.1 SP1 I have existing code which serializes/de-serializes correctly to boost::archive::xml_oarchive Within the same .cpp file I'm trying to serialize instances of the same hierarchy to boost::archive::binary_oarchive using this code: // ultimate sink for serialized data std::ostringstream os; // binary format is OK as it is going onto the clipboard boost::archive::binary_oarchive oa(os); // temp storage std::vector<CDiagramEntity*> vec; // only serialize selected items for (std::vector<CDiagramEntity*>::iterator it = m_entities.begin(); it != m_entities.end(); ++it) { if ((*it)->IsSelected()) vec.push_back((*it)); } // just serialize the selected item vector (*) oa & BOOST_SERIALIZATION_NVP(vec); * - This is failing in oserializer.hpp line 417, the relevant code being: // sice true_type is valid, and this only gets made if the // pointer oserializer object has been created, this should never // fail bpos_ptr = archive_pointer_oserializer<Archive>::find(* true_type); assert(NULL != bpos_ptr); // <------------------ this assert triggered. I note the confident comment above find(). Can anyone help here? Many thanks Jerry