diff --git a/EgtGeomKernel.rc b/EgtGeomKernel.rc
index ad1cd5b..8b77bab 100644
Binary files a/EgtGeomKernel.rc and b/EgtGeomKernel.rc differ
diff --git a/OffsetCurveOnX.cpp b/OffsetCurveOnX.cpp
index eddfd85..c3d3d1d 100644
--- a/OffsetCurveOnX.cpp
+++ b/OffsetCurveOnX.cpp
@@ -1,7 +1,7 @@
 //----------------------------------------------------------------------------
-//  EgalTech 2016-2016
+//  EgalTech 2016-2020
 //----------------------------------------------------------------------------
-// File : OffsetCurveOnX.cpp         Data : 02.04.16       Versione : 1.6o4
+// File : OffsetCurveOnX.cpp         Data : 13.02.20       Versione : 2.2b2
 // Contenuto : Classe per offset di Curve lungo la sola X.
 //
 //
@@ -17,8 +17,8 @@
 #include "CurveLine.h"
 #include "CurveArc.h"
 #include "GeoConst.h"
-#include "/EgtDev/Include/EgkOffsetCurveOnX.h"
-#include "/EgtDev/Include/EgkIntersCurves.h"
+#include "/EgtDev/Include/EGkOffsetCurveOnX.h"
+#include "/EgtDev/Include/EGkIntersCurves.h"
 #include "/EgtDev/Include/EGkDistPointCurve.h"
 #include "/EgtDev/Include/EgtPointerOwner.h"
 #include <algorithm>
@@ -107,30 +107,20 @@ OffsetCurveOnX::Make( const ICurve* pCrv, double dDist)
       return false ;
    // indice della prima curva (1-based, per poter assegnare un significato al segno)
    int nInd1 = 1 ;
-   // recupero la prima curva e la processo
+   // recupero la prima curva
    PtrOwner<ICurve> pCrv1( ccCopy2.RemoveFirstOrLastCurve( false)) ;
-   if ( IsNull( pCrv1))
-      return false ;
-   // eseguo semplice offset orizzontale
-   pCrv1->SetTempProp( nInd1) ;
-   SimpleOffsetOnX( pCrv1, dDist) ;
-   // curve successive
-   PtrOwner<ICurve> pCrv2( ccCopy2.RemoveFirstOrLastCurve( false)) ;
-   while ( ! IsNull( pCrv2)) {
-     // eseguo semplice offset
-      pCrv2->SetTempProp( nInd1 + 1) ;
-      SimpleOffsetOnX( pCrv2, dDist) ;
-     // metto in lista curva precedente
-      m_CrvLst.push_back( Release( pCrv1)) ;
-     // aggiorno curva precedente
-      ++ nInd1 ;
-      pCrv1.Set( Release( pCrv2)) ;
+   while ( ! IsNull( pCrv1)) {
+     // eseguo semplice offset orizzontale
+      pCrv1->SetTempProp( nInd1) ;
+      if ( SimpleOffsetOnX( pCrv1, dDist))
+        // metto in lista
+         m_CrvLst.push_back( Release( pCrv1)) ;
      // passo alla curva successiva
-      pCrv2.Set( ccCopy2.RemoveFirstOrLastCurve( false)) ;
+      pCrv1.Set( ccCopy2.RemoveFirstOrLastCurve( false)) ;
+      ++ nInd1 ;
    }
-  // Metto in lista l'ultima curva rimasta
-   if ( ! IsNull( pCrv1))
-      m_CrvLst.push_back( Release( pCrv1)) ;
+   if ( m_CrvLst.empty())
+      return false ;
 
   // Secondo passo : taglio angoli tipo interni
    ICurve* pPrev = nullptr ;
@@ -387,8 +377,9 @@ SimpleOffsetOnX( ICurve* pCrv, double dDist)
    Point3d ptStart, ptEnd ;
    pCrv->GetStartPoint( ptStart) ;
    pCrv->GetEndPoint( ptEnd) ;
-   if ( abs( ptStart.y - ptEnd.y) < EPS_SMALL)
-      ;
+   if ( abs( ptStart.y - ptEnd.y) < EPS_SMALL) {
+      return ( abs( ptStart.x - ptEnd.x) > dDist) ;
+   }
    else if ( ptStart.y < ptEnd.y)
       pCrv->Translate( Vector3d( dDist, 0, 0)) ;
    else