diff --git a/src/basic_archive.cpp b/src/basic_archive.cpp
index 92a7b1a4..78a068b3 100644
--- a/src/basic_archive.cpp
+++ b/src/basic_archive.cpp
@@ -57,13 +57,23 @@ BOOST_ARCHIVE_SIGNATURE(){
 // 5 - Boost 1.36
 //     changed serialization of collections: adding version even for primitive
 //     types caused backwards compatibility breaking change in 1.35
-// 6 - Boost 1.41, serializing collection sizes as std::size_t
-// 7 - separated version_type into library_version_type and class_version_type
+// 6 - Boost 1.41 17 Nov 200
+//     serializing collection sizes as std::size_t
+// 7   Boost 1.42 2 Feb 2010
+//     error - changed binary version to 16 bits w/o changing library version #
+//     That is - binary archives are recorded with #6 even though they are
+//     different from the previous versions.  This means that binary archives
+//     created with versions 1.42 and 1.43 will have to be fixed with a special
+//     program which fixes the library version # in the header
+//     Boost 1.43 6 May 2010
+//     no change
+// 8 - Boost 1.44
+//     separated version_type into library_version_type and class_version_type
 //     changed version_type to be stored as 8 bits.
 
 BOOST_ARCHIVE_DECL(library_version_type)
 BOOST_ARCHIVE_VERSION(){
-    return library_version_type(7);
+    return library_version_type(8);
 }
 
 } // namespace archive
diff --git a/src/basic_iarchive.cpp b/src/basic_iarchive.cpp
index a1defa97..29a9a259 100644
--- a/src/basic_iarchive.cpp
+++ b/src/basic_iarchive.cpp
@@ -29,6 +29,9 @@ namespace std{
 #include <boost/serialization/tracking.hpp>
 
 #define BOOST_ARCHIVE_SOURCE
+// include this to prevent linker errors when the
+// same modules are marked export and import.
+#define BOOST_SERIALIZATION_SOURCE
 
 #include <boost/archive/archive_exception.hpp>
 
diff --git a/src/basic_oarchive.cpp b/src/basic_oarchive.cpp
index 7e098874..f3473b9a 100644
--- a/src/basic_oarchive.cpp
+++ b/src/basic_oarchive.cpp
@@ -21,6 +21,9 @@
 // including this here to work around an ICC in intel 7.0
 // normally this would be part of basic_oarchive.hpp below.
 #define BOOST_ARCHIVE_SOURCE
+// include this to prevent linker errors when the
+// same modules are marked export and import.
+#define BOOST_SERIALIZATION_SOURCE
 
 #include <boost/archive/detail/decl.hpp>
 #include <boost/archive/basic_archive.hpp>
diff --git a/src/basic_serializer_map.cpp b/src/basic_serializer_map.cpp
index cf5917f9..c6cfb733 100644
--- a/src/basic_serializer_map.cpp
+++ b/src/basic_serializer_map.cpp
@@ -16,6 +16,10 @@
 #include <utility>
 
 #define BOOST_ARCHIVE_SOURCE
+// include this to prevent linker errors when the
+// same modules are marked export and import.
+#define BOOST_SERIALIZATION_SOURCE
+
 #include <boost/archive/archive_exception.hpp>
 #include <boost/serialization/throw_exception.hpp>
 
diff --git a/src/shared_ptr_helper.cpp b/src/shared_ptr_helper.cpp
index ec15e2e2..33c15b78 100644
--- a/src/shared_ptr_helper.cpp
+++ b/src/shared_ptr_helper.cpp
@@ -19,6 +19,9 @@
 #include <cstddef> // NULL
 
 #define BOOST_ARCHIVE_SOURCE
+// include this to prevent linker errors when the
+// same modules are marked export and import.
+#define BOOST_SERIALIZATION_SOURCE
 
 #include <boost/serialization/throw_exception.hpp>
 #include <boost/serialization/void_cast.hpp>
diff --git a/src/void_cast.cpp b/src/void_cast.cpp
index 52e22b97..de841716 100644
--- a/src/void_cast.cpp
+++ b/src/void_cast.cpp
@@ -226,8 +226,9 @@ void_caster::recursive_register(bool includes_virtual_base) const {
     #endif
 
     std::pair<void_cast_detail::set_type::const_iterator, bool> result;
+    // comment this out for now.  
     result = s.insert(this);
-    assert(result.second);
+    //assert(result.second);
 
     // generate all implied void_casts.
     void_cast_detail::set_type::const_iterator it;
diff --git a/src/xml_archive_exception.cpp b/src/xml_archive_exception.cpp
index ad16bd9e..f011066e 100644
--- a/src/xml_archive_exception.cpp
+++ b/src/xml_archive_exception.cpp
@@ -12,12 +12,12 @@
 #  pragma warning (disable : 4786) // too long name, harmless warning
 #endif
 
-#define BOOST_ARCHIVE_SOURCE
 
 #include <exception>
 #include <cassert>
 #include <string>
 
+#define BOOST_ARCHIVE_SOURCE
 #include <boost/archive/xml_archive_exception.hpp>
 
 namespace boost {