Index: boost/archive/basic_binary_iarchive.hpp
===================================================================
--- boost/archive/basic_binary_iarchive.hpp	(revision 72264)
+++ boost/archive/basic_binary_iarchive.hpp	(working copy)
@@ -85,12 +85,12 @@
     void load_override(tracking_type & t, int /*version*/){
         library_version_type lvt = this->get_library_version();
         if(boost::archive::library_version_type(6) < lvt){
-            int_least8_t x=0;
+            bool x=0;
             * this->This() >> x;
             t = boost::archive::tracking_type(x);
         }
         else{
-            bool x=0;
+            int_least8_t x=0;
             * this->This() >> x;
             t = boost::archive::tracking_type(x);
         }
@@ -102,12 +102,12 @@
         }
         else
         if(boost::archive::library_version_type(6) < lvt){
-            int_least16_t x=0;
+            int x=0;
             * this->This() >> x;
-            t = boost::archive::class_id_type(x);
+            t = boost::archive::class_id_type(x);            
         }
         else{
-            int x=0;
+            int_least16_t x=0;
             * this->This() >> x;
             t = boost::archive::class_id_type(x);
         }
@@ -183,7 +183,7 @@
             t = boost::serialization::item_version_type(x);
         }
         else{
-            unsigned int x=0;
+             unsigned int x=0;
             * this->This() >> x;
             t = boost::serialization::item_version_type(x);
         }
Index: libs/serialization/src/basic_iarchive.cpp
===================================================================
--- libs/serialization/src/basic_iarchive.cpp	(revision 72264)
+++ libs/serialization/src/basic_iarchive.cpp	(working copy)
@@ -96,23 +96,37 @@
     {
         const basic_iserializer * m_bis;
         const class_id_type m_class_id;
+        const bool m_old_type_info;
+
         cobject_type(
             std::size_t class_id,
-            const basic_iserializer & bis
+            const basic_iserializer & bis, 
+            bool old_type_info
         ) : 
             m_bis(& bis),
-            m_class_id(class_id)
+            m_class_id(class_id),
+            m_old_type_info(old_type_info)
         {}
+
+
         cobject_type(const cobject_type & rhs) : 
             m_bis(rhs.m_bis),
-            m_class_id(rhs.m_class_id)
+            m_class_id(rhs.m_class_id),
+            m_old_type_info(rhs.m_old_type_info)
         {}
+
         // the following cannot be defined because of the const
         // member.  This will generate a link error if an attempt
         // is made to assign.  This should never be necessary
         cobject_type & operator=(const cobject_type & rhs);
+        
         bool operator<(const cobject_type &rhs) const
         {
+            // old versions with objects across DLL's depend on not mathcing
+            // since class info will be stored out twice, we must not match in both cases
+            if(m_old_type_info)
+                return &m_bis->get_eti() < &rhs.m_bis->get_eti();
+            
             return *m_bis < *(rhs.m_bis);
         }
     };
@@ -289,15 +303,22 @@
     }
 }
 
+const bool boost_archive_ver_5_is_pre_140  = true;
+
 inline class_id_type
 basic_iarchive_impl::register_type(
     const basic_iserializer & bis
-){
+)
+{
+    // if we are serializing in an old archive (before version 5, or version 5 and the user specified that 
+    // archive revision 5 is actually 1_39 not 1_40 [ as this is ambigous ]
+    bool old_cid_lookup = (m_archive_library_version < 5 || (5 == m_archive_library_version &&  boost_archive_ver_5_is_pre_140));
+
     class_id_type cid(cobject_info_set.size());
-    cobject_type co(cid, bis);
-    std::pair<cobject_info_set_type::const_iterator, bool>
-        result = cobject_info_set.insert(co);
+    cobject_type  co(cid, bis, old_cid_lookup);
 
+    std::pair<cobject_info_set_type::const_iterator, bool> result = cobject_info_set.insert(co);
+
     if(result.second){
         cobject_id_vector.push_back(cobject_id(bis));
         BOOST_ASSERT(cobject_info_set.size() == cobject_id_vector.size());