diff --git a/EgtGeomKernel.rc b/EgtGeomKernel.rc
index 1ee6f86..0b2f2d2 100644
Binary files a/EgtGeomKernel.rc and b/EgtGeomKernel.rc differ
diff --git a/SurfFlatRegion.cpp b/SurfFlatRegion.cpp
index 5441445..4c8783e 100644
--- a/SurfFlatRegion.cpp
+++ b/SurfFlatRegion.cpp
@@ -89,6 +89,7 @@ SurfFlatRegion::AddExtLoop( ICurve* pCrv)
    if ( ! pCrv->GetArea( plPlane, dArea))
       return false ;
    pCrv->SetExtrusion( plPlane.vtN) ;
+   pCrv->SetThickness( 0) ;
   // rimuovo eventuali sovrapposizioni (calcolate nel suo piano)
    ICURVEPLIST CrvLst ;
    if ( ! RemoveCurveOverlaps( pCrv, true, true, CrvLst))
@@ -230,6 +231,7 @@ SurfFlatRegion::AddIntLoop( ICurve* pCrv)
    if ( ! pCrv->GetArea( plPlane, dArea))
       return false ;
    pCrv->SetExtrusion( plPlane.vtN) ;
+   pCrv->SetThickness( 0) ;
   // rimuovo eventuali sovrapposizioni (calcolate nel suo piano)
    ICURVEPLIST CrvLst ;
    if ( ! RemoveCurveOverlaps( pCrv, true, true, CrvLst))