diff --git a/examples/SharedMemory/PhysicsServerExample.cpp b/examples/SharedMemory/PhysicsServerExample.cpp
index 2dc7145be..36ec1f18b 100644
--- a/examples/SharedMemory/PhysicsServerExample.cpp
+++ b/examples/SharedMemory/PhysicsServerExample.cpp
@@ -1764,8 +1764,9 @@ void PhysicsServerExample::initPhysics()
 		}
 	}
 
+	m_args[0].m_cs->lock();
 	m_args[0].m_cs->setSharedParam(1, eGUIHelperIdle);
-
+	m_args[0].m_cs->unlock();
 	m_args[0].m_cs2->lock();
 
 	{
diff --git a/examples/pybullet/examples/createObstacleCourse.py b/examples/pybullet/examples/createObstacleCourse.py
index 1194a213a..ef145c72c 100644
--- a/examples/pybullet/examples/createObstacleCourse.py
+++ b/examples/pybullet/examples/createObstacleCourse.py
@@ -21,28 +21,6 @@ colSphereId = p.createCollisionShape(p.GEOM_SPHERE,radius=sphereRadius)
 #convex mesh from obj
 stoneId = p.createCollisionShape(p.GEOM_MESH,fileName="stone.obj")
 
-#concave mesh from obj
-stoneId = p.createCollisionShape(p.GEOM_MESH,fileName="stone.obj", flags=p.GEOM_FORCE_CONCAVE_TRIMESH)
-
-
-verts=[[-0.246350, -0.246483, -0.000624],
-	[ -0.151407, -0.176325, 0.172867],
-	[ -0.246350, 0.249205, -0.000624],
-	[ -0.151407, 0.129477, 0.172867],
-	[ 0.249338, -0.246483, -0.000624],
-	[ 0.154395, -0.176325, 0.172867],
-	[ 0.249338, 0.249205, -0.000624],
-	[ 0.154395, 0.129477, 0.172867]]
-#convex mesh from vertices
-stoneConvexId = p.createCollisionShape(p.GEOM_MESH,vertices=verts)
-
-indices=[0,3,2,3,6,2,7,4,6,5,0,4,6,0,2,3,5,7,0,1,3,3,7,6,7,5,4,5,1,0,6,4,0,3,1,5]
-
-#concave mesh from vertices+indices
-stoneConcaveId = p.createCollisionShape(p.GEOM_MESH,vertices=verts, indices=indices)
-
-stoneId = stoneConvexId
-#stoneId = stoneConcaveId
 
 
 boxHalfLength = 0.5