"serialization/collections_load_imp.hpp" defines a private template class stack_allocate for stack-based reservation of uninitialized memory. To the best of my knowledge, the way it does so is not std-conformant due to alignment issues. Fortunately, (undocumented) "boost/aligned_storage.hpp" provides a template class named aligned_storage which handles the issue, so I guess the problem can be solved by just using this facility instead of stack_allocate. Joaquín M López Muñoz Telefónica, Investigación y Desarrollo