Dear All, I'm facing the following problem. I have the following class hierarchy: AbstractBase <--- AbstractDerived <---- ConcreteDerived I managed to make the serialization of AbstractBase using text and binary archives (text_[i/o]archive, binary_[i/o]archive), tested, and works fine. However when AbstractBase pointers are sent with MPI functions a runtime exception occurs: /usr/include/boost-1_35/boost/archive/detail/oserializer.hpp:413: static void boost::archive::detail::save_pointer_type::polymorphic<T>::save(Archive&, const T&, const boost::archive::detail::basic_pointer_oserializer*) [with T = AbstractBase, Archive = boost::mpi::packed_oarchive, TPtr = AbstractBase*]: Assertion `__null != bpos_ptr' failed. I appreciate any help. Thank you, and have a nice weekend. Andras ____________________________________________________________________________________ Moody friends. Drama queens. Your life? Nope! - their life, your story. Play Sims Stories at Yahoo! Games. http://sims.yahoo.com/