Hi, in trying to debug a problem we are experiencing here with binary archives I tried switching to text archives to see if we get the same behaviour. However, now I can't even compile my code! A straight swap for binary_oarchive to text_oarchive gives me these errors: error: invalid application of ‘sizeof’ to incomplete type ‘boost::STATIC_ASSERTION_FAILURE<false>’ The arrangement of my header files is like so: // base_msg.h #include <boost/archive/tmpdir.hpp> #include <boost/archive/text_oarchive.hpp> #include <boost/archive/text_iarchive.hpp> using boost::archive::text_oarchive; using boost::archive::text_iarchive; class Base { private: text_oarchive out; text_iarchive in; }; template<class T> class MsgSerializer : public T, public Base { ... }; // msg.h #include "base_msg.h" // Boost containers, algorithms etc. #include <boost/serialization/map.hpp> #include <boost/serialization/string.hpp> #include <boost/serialization/vector.hpp> #include <boost/serialization/base_object.hpp> #include <boost/serialization/split_member.hpp> struct MyMsg_ { template<class Archive> void serialize(Archive &p_archiver, const unsigned int /* version */) { } }; typedef MsgSerializer<MyMsg_> MyMsg; etc. I have literally just changed binary_ for text_ and it now spits out said error whenever it encounters MyMsg_. This used to compile fine. Even if I re-arrange the headers I still get the same error? What must I change to get text_archives to compile!? I've also tried adding access.hpp (which I didn't have to do before) and serialization.hpp all to no avail. Regards, Jim -- James Vanns Systems Programmer Framestore CFC Ltd.