diff --git a/EGrDllMain.cpp b/EGrDllMain.cpp
index 7326ab6..691468f 100644
--- a/EGrDllMain.cpp
+++ b/EGrDllMain.cpp
@@ -44,12 +44,13 @@ DllMain( HMODULE hModule, DWORD dwReason, LPVOID lpReserved)
 {
 
    if ( dwReason == DLL_PROCESS_ATTACH) {
-      #if defined( NDEBUG)
-         BOOL IsDbgPresent = FALSE ;
-         CheckRemoteDebuggerPresent( GetCurrentProcess(), &IsDbgPresent) ;
-         if ( IsDbgPresent)
-            return 0 ;
-      #endif
+      // Controllo commentato per problemi con VB.NET
+      //#if defined( NDEBUG)
+      //   BOOL IsDbgPresent = FALSE ;
+      //   CheckRemoteDebuggerPresent( GetCurrentProcess(), &IsDbgPresent) ;
+      //   if ( IsDbgPresent)
+      //      return 0 ;
+      //#endif
       s_hModule = hModule ;
       EGT_TRACE( "EgtGraphics.dll Initializing!\n") ;
    }
diff --git a/EgtGraphics.rc b/EgtGraphics.rc
index 2fa6fc5..18c012b 100644
Binary files a/EgtGraphics.rc and b/EgtGraphics.rc differ
diff --git a/ObjNewGraphics.cpp b/ObjNewGraphics.cpp
index 214692c..ae69087 100644
--- a/ObjNewGraphics.cpp
+++ b/ObjNewGraphics.cpp
@@ -275,7 +275,7 @@ ObjNewGraphics::EndTriangles( void)
 bool
 ObjNewGraphics::Draw( int nStat, int nMark, bool bShowAux)
 {
-   if ( m_pScene == nullptr  ||  ! m_pScene->MakeCurrent())
+   if ( ! m_bValid  ||  m_pScene == nullptr  ||  ! m_pScene->MakeCurrent())
       return false ;
 
   // se vuoto non faccio alcunché
diff --git a/SceneGeom.cpp b/SceneGeom.cpp
index d517132..2ce703a 100644
--- a/SceneGeom.cpp
+++ b/SceneGeom.cpp
@@ -151,7 +151,15 @@ Scene::DrawGeoObj( const IGdbIterator& iIter, int nPass, MdStMk siObj)
 
   // se non esiste grafica associata, la creo
    if ( pGeoObj->GetObjGraphics() == nullptr) {
-      ObjEGrGraphics* pGraphics = CreateObjEGrGraphics( m_bNewWay) ;
+     // nuova modalità grafica solo per superfici con molti triangoli
+      const int N_MIN_TRIA_NEWWAY = 100 ; 
+      bool bNewWay = false ;
+      if ( m_bNewWay  &&  nGeoType == SRF_TRIMESH) {
+         const ISurfTriMesh* pSTM = GetSurfTriMesh( pGeoObj) ;
+         if ( pSTM != nullptr  &&  pSTM->GetTriangleNum() > N_MIN_TRIA_NEWWAY)
+            m_bNewWay = true ;
+      }  
+      ObjEGrGraphics* pGraphics = CreateObjEGrGraphics( bNewWay) ;
       if ( pGraphics == nullptr)
          return false ;
       pGraphics->SetScene( this) ;
@@ -219,9 +227,9 @@ Scene::DrawGeoObj( const IGdbIterator& iIter, int nPass, MdStMk siObj)
          pGraphics->AddColor( cCol) ;
          pGraphics->AddPolyLine( PL) ; 
          // eventuali segni ausiliari (frecce,...)
-         Point3d ptStart ;
-         if ( PL.GetFirstPoint( ptStart))
-            pGraphics->AddPoint( ptStart, true) ;
+         //Point3d ptStart ;
+         //if ( PL.GetFirstPoint( ptStart))
+         //   pGraphics->AddPoint( ptStart, true) ;
          PolyLine PLA ;
          if ( CalcCurveTipArrow( PL, PLA))
             pGraphics->AddPolyLine( PLA, true) ;