Hello, I recently (yesterday) "upgraded" to 1_36_trunk version and have trouble with binary archives which are no more readable by the framework... I am using Visual Studio 2005 on Vista I have a Project object embedding a MeteoStation object.... The framework is able to load previous MeteoStation files saved in binary format... but is not able to loas a project object embedding a MeteoStation object (not a pointer or reference : whole object)... and the problem occurs while loading this MeteoStation object... on the Name field which is a std::string... (MeteoStation have a BOOST_SERIALIZATION_SPLIT_MEMBER() in case it does matter) The issue occurs in the <boost/archive/impl/basic_binary_iprimitive.ipp> line 91 template<class Archive, class Elem, class Tr> BOOST_ARCHIVE_OR_WARCHIVE_DECL(void) basic_binary_iprimitive<Archive, Elem, Tr>::load(std::string & s) {... where the load method which i I guess supposed to return the size of the object returns a pretty "exotic value" and mess-up the following... I hope this helps to solve some issue... and may answer more questions if needed... regards, Mathieu -- http://www.incub.net/