diff --git a/AdjustLoops.cpp b/AdjustLoops.cpp
index 9b37a4d..956e199 100644
--- a/AdjustLoops.cpp
+++ b/AdjustLoops.cpp
@@ -317,6 +317,8 @@ AdjustLoops( ICurve* pCurve, ICURVEPLIST& CrvLst, bool bNeedSameProp)
          pCrvCo->RemoveSmallDefects( 2 * LIN_TOL_MIN, ANG_TOL_STD_DEG, true) ;
         // unisco eventuali tratti allineati
          pCrvCo->MergeCurves( LIN_TOL_MIN, ANG_TOL_STD_DEG, true, bNeedSameProp) ;
+        // richiudo i loop per sicurezza
+         pCrvCo->Close() ;
       }
    }
 
diff --git a/CurveComposite.cpp b/CurveComposite.cpp
index 9b1d850..2af9c4f 100644
--- a/CurveComposite.cpp
+++ b/CurveComposite.cpp
@@ -291,9 +291,13 @@ CurveComposite::Close( void)
       return true ;
   // se molto vicini li modifico
    if ( AreSamePointEpsilon( ptStart, ptEnd, 10 * EPS_SMALL)) {
+     // se un solo arco
+      if ( m_CrvSmplS.size() == 1  &&  m_CrvSmplS.front()->GetType() == CRV_ARC)
+         return GetBasicCurveArc( m_CrvSmplS.front())->ChangeAngCenter( ANG_FULL) ;
+     // caso generale
       Point3d ptMid = Media( ptStart, ptEnd) ;
-      if ( ! ModifyStart( ptMid)  ||
-           ! ModifyEnd( ptMid))
+      if ( ! m_CrvSmplS.front()->ModifyStart( ptMid)  ||
+           ! m_CrvSmplS.back()->ModifyEnd( ptMid))
          return false ;
    }   
   // altrimenti aggiungo la linea di chiusura