diff --git a/EGkGeoObj.h b/EGkGeoObj.h
index 69503cd..e8b7e5d 100644
--- a/EGkGeoObj.h
+++ b/EGkGeoObj.h
@@ -44,7 +44,7 @@ class __declspec( novtable) IGeoObj
       virtual bool Translate( const Vector3d& vtMove) = 0 ;
       virtual bool Rotate( const Point3d& ptAx, const Vector3d& vtAx, double dCosAng, double dSinAng) = 0 ;
       virtual bool Rotate( const Point3d& ptAx, const Vector3d& vtAx, double dAngRad) = 0 ;
-      virtual bool Scale( const Point3d& ptCen, double dCoeffX, double dCoeffY, double dCoeffZ) = 0 ;
+      virtual bool Scale( const Frame3d& frRef, double dCoeffX, double dCoeffY, double dCoeffZ) = 0 ;
       virtual bool Mirror( const Point3d& ptOn, const Vector3d& vtNorm) = 0 ;
       virtual bool ToGlob( const Frame3d& frRef) = 0 ;
       virtual bool ToLoc( const Frame3d& frRef) = 0 ;
diff --git a/EGkGeomDB.h b/EGkGeomDB.h
index a47b9b5..dd795bd 100644
--- a/EGkGeomDB.h
+++ b/EGkGeomDB.h
@@ -51,7 +51,7 @@ class __declspec( novtable) IGeomDB
       virtual bool Translate( int nId, const Vector3d& vtMove) = 0 ;
       virtual bool Rotate( int nId, const Point3d& ptAx, const Vector3d& vtAx, double dCosAng, double dSinAng) = 0 ;
       virtual bool Rotate( int nId, const Point3d& ptAx, const Vector3d& vtAx, double dAngDeg) = 0 ;
-      virtual bool Scale( int nId, const Point3d& ptCen, double dCoeffX, double dCoeffY, double dCoeffZ) = 0 ;
+      virtual bool Scale( int nId, const Frame3d& frRef, double dCoeffX, double dCoeffY, double dCoeffZ) = 0 ;
       virtual bool Mirror( int nId, const Point3d& ptOn, const Vector3d& vtNorm) = 0 ;
 } ;
 
diff --git a/EGkPoint3d.h b/EGkPoint3d.h
index df930aa..0f737ac 100644
--- a/EGkPoint3d.h
+++ b/EGkPoint3d.h
@@ -54,7 +54,7 @@ class EGK_EXPORT Point3d
       void Translate( const Vector3d& vtMove) ;
       bool Rotate( const Point3d& ptAx, const Vector3d& vtAx, double dAngRad) ;
       bool Rotate( const Point3d& ptAx, const Vector3d& vtAx, double dCosAng, double dSinAng) ;
-      bool Scale( const Point3d& ptCen, double dCoeffX, double dCoeffY, double dCoeffZ) ;
+      bool Scale( const Frame3d& frRef, double dCoeffX, double dCoeffY, double dCoeffZ) ;
       bool Mirror( const Point3d& ptOn, const Vector3d& vtNorm) ;
       bool ToGlob( const Frame3d& frRef) ;
       bool ToLoc( const Frame3d& frRef) ;
diff --git a/EGkVector3d.h b/EGkVector3d.h
index 06fb8e5..2b1b8d1 100644
--- a/EGkVector3d.h
+++ b/EGkVector3d.h
@@ -74,7 +74,7 @@ class EGK_EXPORT Vector3d
       bool Normalize( void) ;
       bool Rotate( const Vector3d& vtAx, double dAngRad) ;
       bool Rotate( const Vector3d& vtAx, double dCosAng, double dSinAng) ;
-      bool Scale( double dCoeffX, double dCoeffY, double dCoeffZ) ;
+      bool Scale( const Frame3d& frRef, double dCoeffX, double dCoeffY, double dCoeffZ) ;
       bool Mirror( const Vector3d& vtNorm) ;
       bool ToGlob( const Frame3d& frRef) ;
       bool ToLoc( const Frame3d& frRef) ;
diff --git a/EgtPerfCounter.h b/EgtPerfCounter.h
index 158cf47..8b0085b 100644
--- a/EgtPerfCounter.h
+++ b/EgtPerfCounter.h
@@ -22,7 +22,8 @@ class PerformanceCounter
       PerformanceCounter( void)
          { QueryPerformanceFrequency( (LARGE_INTEGER*) &m_lnFreq) ;
            if ( m_lnFreq <= 0)
-              m_lnFreq = 1 ; }
+              m_lnFreq = 1 ;
+           Start() ; }
       void Start( void)
          { QueryPerformanceCounter( (LARGE_INTEGER*) &m_lnStart) ; }
       double Stop( void)