[Boost-users] [serialization] strange assert with wrong cid

Hello, All! sometimes I got errors in basic_iarchive_impl::load_pointer in line assert(new_cid == cid). Can anyone tell me what exactly this assertion means and whan it can occurs? Is this error posiible if I remove some BOOST_CLASS_EXPORTs from my code and try to load old files? With best regards, Sergey