From Wang Rui, "Henry and Brendan just found a small bug of the ListSerializer which

will cause the writing of osg::Switch incorrectly. The original thread
was posted on osg-users. I would like to follow the suggestion of
Brendan and add a std::endl before the END_BRACKET in
ListSerializer::write().
"

include/osgDB/Serializer

@@ -735,6 +735,7 @@ public:
             {
                 os << (*itr);
             }
+            os << std::endl;
             os << END_BRACKET << std::endl;
         }
         return true;