diff --git a/PocketingNT.cpp b/PocketingNT.cpp
index 645f949..6d3badd 100644
--- a/PocketingNT.cpp
+++ b/PocketingNT.cpp
@@ -106,7 +106,7 @@ const string UN_OPENEXTENSION = "OpenExtension" ;
 // _debug
 #define DEBUG_OPEN_EDGE_EXTENSION 0
 #define DEBUG_FLATREGIONS 0
-#if DEBUG_OPEN_EDGE_EXTENSION  || DEBUG_FLATREGIONS
+#if DEBUG_OPEN_EDGE_EXTENSION || DEBUG_FLATREGIONS
    #include "EgtDev/Include/EGkGeoPoint3d.h"
    #include "EgtDev/Include/EGkFrame3d.h"
 #endif
@@ -280,6 +280,7 @@ PocketingNT::PocketingNT( void)
    m_bAggrBottom = false ;
    m_bOpenOutRaw = false ;
    m_dOpenMinSafe = 0 ;
+   m_bRunning = false ;
 }
 
 //----------------------------------------------------------------------------
@@ -602,7 +603,7 @@ PocketingNT::Preview( bool bRecalc)
    m_pGeomDB->GetInfo( nToolId, TTH_DIAM, m_dTHoldDiam) ;
 
   // se necessario, eseguo concatenamento ed inserisco i percorsi sotto la geometria ausiliaria
-   if ( bChain  &&  ! Chain( nAuxId))  {
+   if ( bChain  &&  ! Chain( nAuxId)) {
       m_pMchMgr->SetLastError( 2421, "Error in PocketingNT : Chaining failed") ;
       return false ;
    }
@@ -634,6 +635,21 @@ PocketingNT::Preview( bool bRecalc)
 //----------------------------------------------------------------------------
 bool
 PocketingNT::Apply( bool bRecalc, bool bPostApply)
+{
+  // se calcoli già in corso, esco
+   if ( m_bRunning) {
+      LOG_DBG_INFO( GetEMkLogger(), "PocketingNT::Apply already running") ;
+      return true ;
+   }
+   m_bRunning = true ;
+   bool bOk = MyApply( bRecalc, bPostApply) ;
+   m_bRunning = false ;
+   return bOk ;
+}
+
+//----------------------------------------------------------------------------
+bool
+PocketingNT::MyApply( bool bRecalc, bool bPostApply)
 {
   // reset numero percorsi di svuotatura generati
    int nCurrPockets = m_nPockets ;
@@ -1214,7 +1230,7 @@ PocketingNT::GetCurves( SelData Id, ICURVEPLIST& lstPC)
    }
   // se altrimenti superficie
    else if ( pGObj->GetType() == SRF_TRIMESH) {
-     // recupero la trimesh 
+     // recupero la trimesh
       const ISurfTriMesh* pSurf = ::GetSurfTriMesh( pGObj) ;
       if ( pSurf == nullptr)
          return false ;
@@ -1385,7 +1401,6 @@ PocketingNT::SetSfrLoopsAllTempProp( int nSfrId, ISurfFlatRegion* pSfr)
       for ( int& i : vOpen)
          pSfr->SetCurveTempProp( 0, nCount, i, TEMP_PROP_OPEN_EDGE, 0) ;
    } ;
-
    return true ;
 }
 
@@ -1399,7 +1414,7 @@ PocketingNT::ResetCurveAllTempProp( ICurve* pCurve)
    ICurveComposite* pCC = GetCurveComposite( pCurve) ;
    if ( pCC != nullptr) {
       for ( int i = 0 ; i < pCC->GetCurveCount() ; ++ i)
-         pCC->SetCurveTempProp( i, 0) ;
+         pCC->SetCurveTempProp( i, TEMP_PROP_CLOSE_EDGE) ;
    }
    return true ;
 }
@@ -1493,7 +1508,7 @@ PocketingNT::Chain( int nGrpDestId)
       if ( pCrvCompo->GetCurveCount() == 0)
          continue ;
      // se la curva non è chiusa, errore
-      if (  ! pCrvCompo->IsClosed()) {
+      if ( ! pCrvCompo->IsClosed()) {
          m_pMchMgr->SetLastError( 2402, "Error in PocketingNT : Open Contour") ;
          return false ;
       }
@@ -1890,7 +1905,7 @@ PocketingNT::ExtendOpenEdgesToRaw( ICurveComposite* pCompo, const Vector3d& vtEx
       m_pGeomDB->SetMaterial( a, Color( 0.2, 0.2, 0.8, .65)) ;
    #endif
 
-  // recupero il Box del grezzo definito dal frame implito dal piano
+  // recupero il Box del grezzo definito dal frame implicito dal piano
    Frame3d frCut ;
    if ( ! frCut.Set( ptC, vtExtr))
       return false ;
diff --git a/PocketingNT.h b/PocketingNT.h
index a9464d3..3649fd7 100644
--- a/PocketingNT.h
+++ b/PocketingNT.h
@@ -93,6 +93,7 @@ class PocketingNT : public Machining
       PocketingNT( void) ;
 
    private :
+      bool MyApply( bool bRecalc, bool bPostApply) ;
       bool VerifyGeometry( SelData Id, int& nSubs, int& nType) ;
       bool GetCurves( SelData Id, ICURVEPLIST& lstPC) ;
       bool SetCurveAllTempProp( int nCrvId, bool bForcedClose, ICurve* pCurve, bool* pbSomeOpen = nullptr) ;
@@ -200,4 +201,5 @@ class PocketingNT : public Machining
       double        m_dOpenMinSafe ;    // minima distanza di sicurezza di attacco su lato aperto
       double        m_dOpenExtension ;  // estensione dei tratti aperti dentro al grezzo
       bool          m_bAllClose ;       // flag per forzare i lati come tutti chiusi
+      bool          m_bRunning ;        // flag di calcoli in corso
 } ;
\ No newline at end of file