From Laurens Voerman, "While working on the osg exporter for 3dsmax I found a bug in the TriStripVisitor. I created a small example (attached), and a modified version of

src\osgUtil\TriStripVisitor.cpp where the problem is removed."

src/osgUtil/TriStripVisitor.cpp

@@ -77,8 +77,17 @@ struct VertexAttribComparitor
     void add(osg::Array* array, osg::Geometry::AttributeBinding binding)
     {
         if (binding==osg::Geometry::BIND_PER_VERTEX && array)
+        {
+            for(ArrayList::const_iterator itr=_arrayList.begin();
+                itr!=_arrayList.end();
+                ++itr)
+            {
+                if ((*itr) == array) 
+                    return;
+            }
             _arrayList.push_back(array);
         }
+    }
     
     typedef std::vector<osg::Array*> ArrayList;