Index: src/libchcore/TSharedModificationTracker.h
===================================================================
diff -u -N -ra5aa3c3cb78f3767641de2627d1a49a1dc35b429 -rb193a95402f2bf4c456fb9d65d111caaf6994823
--- src/libchcore/TSharedModificationTracker.h	(.../TSharedModificationTracker.h)	(revision a5aa3c3cb78f3767641de2627d1a49a1dc35b429)
+++ src/libchcore/TSharedModificationTracker.h	(.../TSharedModificationTracker.h)	(revision b193a95402f2bf4c456fb9d65d111caaf6994823)
@@ -38,9 +38,15 @@
 		m_tValue(rSrc.m_tValue),
 		m_rBitset(rSrc.m_rBitset)
 	{
-		m_rBitset[ChangeBit] = true;
 	}
 
+	TSharedModificationTracker(const TSharedModificationTracker<T, Bitset, ChangeBit>& rSrc, Bitset& rBitset) :
+		m_tValue(rSrc.m_tValue),
+		m_rBitset(rBitset)
+	{
+		m_rBitset[ChangeBit] = rBitset[ChangeBit];
+	}
+
 	template<class V>
 	TSharedModificationTracker(Bitset& rBitset, const V& rValue) :
 		m_tValue(rValue),
@@ -54,7 +60,8 @@
 		if(this != &rValue)
 		{
 			m_tValue = rValue.m_tValue;
-			m_rBitset = rValue.m_rBitset;
+			if(m_tValue != rValue.m_tValue)
+				m_rBitset[ChangeBit] = true;
 		}
 
 		return *this;