diff --git a/Apps/Tuto/tuto_oper2.cpp b/Apps/Tuto/tuto_oper2.cpp
index 9e4688f5404143bfa694b0dd583e2a5087a95794..4003fc5e41aa5540863806d63172ab61b0b3c24a 100644
--- a/Apps/Tuto/tuto_oper2.cpp
+++ b/Apps/Tuto/tuto_oper2.cpp
@@ -77,9 +77,8 @@ void MyQT::operation(int x)
 		if (m_selected != NIL)
 		{
 			dm.markAll();
-			myMap.deleteVertex(m_selected);
+			m_selected=myMap.deleteVertex(m_selected);
 			updateMap();
-			m_selected=NIL;
 		}
 		break;
 	case 2:
@@ -106,10 +105,9 @@ void MyQT::operation(int x)
 		if (m_selected != NIL)
 		{
 			PFP::VEC3 M = (position[m_selected] + position[myMap.phi1(m_selected)])/2.0f;
-			Dart d = myMap.collapseEdge(m_selected,true);
-			position[d] = M;
+			m_selected = myMap.collapseEdge(m_selected,true);
+			position[m_selected] = M;
 			updateMap();
-			m_selected=NIL;
 		}
 		break;
 	case 5:
diff --git a/src/Topology/generic/genericmap.cpp b/src/Topology/generic/genericmap.cpp
index 11df43e70c61dfe0c5741e3124d2586e1f479960..2a5c488638a609a5574b4e443b9cf24f18a99033 100644
--- a/src/Topology/generic/genericmap.cpp
+++ b/src/Topology/generic/genericmap.cpp
@@ -124,7 +124,9 @@ GenericMap::~GenericMap()
 
 void GenericMap::initMR()
 {
+#ifndef CGoGN_FORCE_MR
 	m_isMultiRes = true;
+#endif
 
 	m_mrattribs.clear(true) ;
 	m_mrDarts.clear() ;