diff --git a/include/osgTerrain/DataSet b/include/osgTerrain/DataSet
index 9a103f8e7..905d645a7 100644
--- a/include/osgTerrain/DataSet
+++ b/include/osgTerrain/DataSet
@@ -626,7 +626,7 @@ class OSGTERRAIN_EXPORT DataSet : public osg::Referenced
             {
                 DefaultSourceAdvancer() {}
                 
-                bool isActive(const CompositeSource& composite,int index)
+                bool isActive(const CompositeSource& /*composite*/,int /*index*/)
                 {
                     return true;
                 }
diff --git a/include/osgUtil/RenderBin b/include/osgUtil/RenderBin
index 6ac21661c..8b4a0c6b8 100644
--- a/include/osgUtil/RenderBin
+++ b/include/osgUtil/RenderBin
@@ -57,7 +57,9 @@ class OSGUTIL_EXPORT RenderBin : public osg::Object
 
 
 
-        RenderBin(SortMode mode=getDefaultRenderBinSortMode());
+        RenderBin();
+        
+        RenderBin(SortMode mode);
 
         /** Copy constructor using CopyOp to manage deep vs shallow copy.*/
         RenderBin(const RenderBin& rhs,const osg::CopyOp& copyop=osg::CopyOp::SHALLOW_COPY);
diff --git a/include/osgUtil/RenderStage b/include/osgUtil/RenderStage
index 76e681d1d..4114ba4c3 100644
--- a/include/osgUtil/RenderStage
+++ b/include/osgUtil/RenderStage
@@ -36,7 +36,8 @@ class OSGUTIL_EXPORT RenderStage : public RenderBin
     public:
     
 
-        RenderStage(SortMode mode=getDefaultRenderBinSortMode());
+        RenderStage();
+        RenderStage(SortMode mode);
         
         RenderStage(const RenderStage& rhs,const osg::CopyOp& copyop=osg::CopyOp::SHALLOW_COPY);
         
diff --git a/src/osgUtil/RenderBin.cpp b/src/osgUtil/RenderBin.cpp
index d399e4554..7f143a6f8 100644
--- a/src/osgUtil/RenderBin.cpp
+++ b/src/osgUtil/RenderBin.cpp
@@ -114,6 +114,14 @@ RenderBin::SortMode RenderBin::getDefaultRenderBinSortMode()
     return s_defaultBinSortMode;
 }
 
+RenderBin::RenderBin()
+{
+    _binNum = 0;
+    _parent = NULL;
+    _stage = NULL;
+    _sortMode = getDefaultRenderBinSortMode();
+}
+
 RenderBin::RenderBin(SortMode mode)
 {
     _binNum = 0;
diff --git a/src/osgUtil/RenderStage.cpp b/src/osgUtil/RenderStage.cpp
index b06aad6d0..b89a015bb 100644
--- a/src/osgUtil/RenderStage.cpp
+++ b/src/osgUtil/RenderStage.cpp
@@ -23,6 +23,21 @@ using namespace osgUtil;
 // register a RenderStage prototype with the RenderBin prototype list.
 //RegisterRenderBinProxy<RenderStage> s_registerRenderStageProxy;
 
+RenderStage::RenderStage():
+    RenderBin(getDefaultRenderBinSortMode())
+{
+    // point RenderBin's _stage to this to ensure that references to
+    // stage don't go tempted away to any other stage.
+    _stage = this;
+    _stageDrawnThisFrame = false;
+
+    _clearMask = GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT;
+    _clearColor.set(0.0f,0.0f,0.0f,0.0f);
+    _clearAccum.set(0.0f,0.0f,0.0f,0.0f);
+    _clearDepth = 1.0;
+    _clearStencil = 0;
+}
+
 RenderStage::RenderStage(SortMode mode):
     RenderBin(mode)
 {
diff --git a/src/osgWrappers/osgUtil/RenderBin.cpp b/src/osgWrappers/osgUtil/RenderBin.cpp
index 87de04efb..9abad7d77 100644
--- a/src/osgWrappers/osgUtil/RenderBin.cpp
+++ b/src/osgWrappers/osgUtil/RenderBin.cpp
@@ -45,7 +45,8 @@ END_REFLECTOR
 
 BEGIN_OBJECT_REFLECTOR(osgUtil::RenderBin)
 	I_BaseType(osg::Object);
-	I_ConstructorWithDefaults1(IN, osgUtil::RenderBin::SortMode, mode, osgUtil::RenderBin::getDefaultRenderBinSortMode());
+	I_Constructor0();
+	I_Constructor1(IN, osgUtil::RenderBin::SortMode, mode);
 	I_ConstructorWithDefaults2(IN, const osgUtil::RenderBin &, rhs, , IN, const osg::CopyOp &, copyop, osg::CopyOp::SHALLOW_COPY);
 	I_Method0(osg::Object *, cloneType);
 	I_Method1(osg::Object *, clone, IN, const osg::CopyOp &, copyop);
diff --git a/src/osgWrappers/osgUtil/RenderStage.cpp b/src/osgWrappers/osgUtil/RenderStage.cpp
index 023f072b1..769de6362 100644
--- a/src/osgWrappers/osgUtil/RenderStage.cpp
+++ b/src/osgWrappers/osgUtil/RenderStage.cpp
@@ -33,7 +33,8 @@
 
 BEGIN_OBJECT_REFLECTOR(osgUtil::RenderStage)
 	I_BaseType(osgUtil::RenderBin);
-	I_ConstructorWithDefaults1(IN, osgUtil::RenderBin::SortMode, mode, osgUtil::RenderBin::getDefaultRenderBinSortMode());
+	I_Constructor0();
+	I_Constructor1(IN, osgUtil::RenderBin::SortMode, mode);
 	I_ConstructorWithDefaults2(IN, const osgUtil::RenderStage &, rhs, , IN, const osg::CopyOp &, copyop, osg::CopyOp::SHALLOW_COPY);
 	I_Method0(osg::Object *, cloneType);
 	I_Method1(osg::Object *, clone, IN, const osg::CopyOp &, copyop);