diff --git a/simulatorCore/src/robots/catoms3D/catoms3DBlock.h b/simulatorCore/src/robots/catoms3D/catoms3DBlock.h
index c58c5362..898a225c 100644
--- a/simulatorCore/src/robots/catoms3D/catoms3DBlock.h
+++ b/simulatorCore/src/robots/catoms3D/catoms3DBlock.h
@@ -41,10 +41,11 @@ const float tabOrientationAngles[12][3] = { {0,0,0}, {180.0f,0.0f,-90.0f}, {-90.
    tabConnectorPositions[i] : coordinates of connector #i
 
 */
-const float tabConnectorPositions[12][3] = { {1,0,0}, {0,1,0}, {0.5,0.5,M_SQRT2_2},
+const float tabConnectorPositions[13][3] = { {1,0,0}, {0,1,0}, {0.5,0.5,M_SQRT2_2},
                                              {-0.5,0.5,M_SQRT2_2},{-0.5,-0.5,M_SQRT2_2},{0.5,-0.5,M_SQRT2_2},
                                              {-1,0,0}, {0,-1,0}, {-0.5,-0.5,-M_SQRT2_2},
-                                             {0.5,-0.5,-M_SQRT2_2},{0.5,0.5,-M_SQRT2_2},{-0.5,0.5,-M_SQRT2_2}};
+                                             {0.5,-0.5,-M_SQRT2_2},{0.5,0.5,-M_SQRT2_2},{-0.5,0.5,-M_SQRT2_2},
+                                             {0,0,0}};
 
 class Catoms3DBlockCode;
 
diff --git a/simulatorCore/src/robots/catoms3D/catoms3DWorld.cpp b/simulatorCore/src/robots/catoms3D/catoms3DWorld.cpp
index 32821163..25a5c1c1 100644
--- a/simulatorCore/src/robots/catoms3D/catoms3DWorld.cpp
+++ b/simulatorCore/src/robots/catoms3D/catoms3DWorld.cpp
@@ -510,6 +510,7 @@ void Catoms3DWorld::setSelectedFace(int n) {
     else if (name == "Material__78") numSelectedFace = 9;
     else if (name == "Material__69") numSelectedFace = 10;
     else if (name == "Material__70") numSelectedFace = 11;
+    else if (name == "Material__79") numSelectedFace = 12;
     else {
         // cerr << "warning: Unrecognized picking face" << endl;
         numSelectedFace = 13;	// UNDEFINED