diff --git a/anabatic/src/AnabaticEngine.cpp b/anabatic/src/AnabaticEngine.cpp
index 80fe8d3f..0c5c3f6f 100644
--- a/anabatic/src/AnabaticEngine.cpp
+++ b/anabatic/src/AnabaticEngine.cpp
@@ -958,6 +958,14 @@ namespace Anabatic {
   { _timer.stop(); }
 
 
+  void  AnabaticEngine::suspendMeasures ()
+  { _timer.suspend(); }
+
+
+  void  AnabaticEngine::resumeMeasures ()
+  { _timer.resume(); }
+
+
   void  AnabaticEngine::printMeasures ( const string& tag ) const
   {
     ostringstream result;
diff --git a/anabatic/src/anabatic/AnabaticEngine.h b/anabatic/src/anabatic/AnabaticEngine.h
index 2f271784..4389d0e6 100644
--- a/anabatic/src/anabatic/AnabaticEngine.h
+++ b/anabatic/src/anabatic/AnabaticEngine.h
@@ -278,6 +278,8 @@ namespace Anabatic {
       inline const  Timer&            getTimer              () const;
                     void              startMeasures         ();
                     void              stopMeasures          ();
+                    void              suspendMeasures       ();
+                    void              resumeMeasures        ();
                     void              printMeasures         ( const string& ) const;
       inline        void              _add                  ( GCell* );
       inline        void              _remove               ( GCell* );
diff --git a/cumulus/src/plugins/chip/BlockCorona.py b/cumulus/src/plugins/chip/BlockCorona.py
index 221247db..dac9f219 100644
--- a/cumulus/src/plugins/chip/BlockCorona.py
+++ b/cumulus/src/plugins/chip/BlockCorona.py
@@ -538,6 +538,7 @@ class Corona ( object ):
         if self.horizontalDepth > self.verticalDepth:
             contactDepth = self.verticalDepth
 
+        UpdateSession.open()
         for i in range(self._railsNb):
             xBL = self._westSide .getRail(i).axis
             yBL = self._southSide.getRail(i).axis
@@ -582,4 +583,5 @@ class Corona ( object ):
 
         self._westSide.addBlockages()
         self._eastSide.addBlockages()
+        UpdateSession.close()
         return
diff --git a/cumulus/src/plugins/clocktree/ClockTree.py b/cumulus/src/plugins/clocktree/ClockTree.py
index d4beb9c6..cb681c60 100755
--- a/cumulus/src/plugins/clocktree/ClockTree.py
+++ b/cumulus/src/plugins/clocktree/ClockTree.py
@@ -105,6 +105,7 @@ class HTree ( GaugeConfWrapper ):
       raise ErrorMessage( 3, 'ClockTree: clockTree.minimumSide (%g) is less than 100 lambda.' \
                              % DbU.toLambda(self.minSide) )
 
+    UpdateSession.open()
     self.framework    = CRL.AllianceFramework.get()
     self.cell         = cell
     self.area         = area
@@ -126,6 +127,7 @@ class HTree ( GaugeConfWrapper ):
       if not self.masterClock:
         raise ErrorMessage( 3, 'ClockTree: Cell %s has no clock net.' % cell.getName() )
     self._createChildNet( self.topBuffer, 'ck_htree' )
+    UpdateSession.close()
 
     return
 
@@ -371,6 +373,7 @@ class HTreeNode ( object ):
   DownBranch   = 0x0010
 
   def __init__ ( self, topTree, sourceBuffer, area, prefix, flags ):
+    UpdateSession.open()
     self.topTree      = topTree
     self.childs       = []
     self.blLeafs      = []
@@ -406,6 +409,7 @@ class HTreeNode ( object ):
       self.childs.append( HTreeNode( self.topTree, self.tlBuffer, self.tlArea(), self.prefix+'_tl', 0 ) )
       self.childs.append( HTreeNode( self.topTree, self.trBuffer, self.trArea(), self.prefix+'_tr', 0 ) )
 
+    UpdateSession.close()
     return
 
   def xmin      ( self ): return self.area.getXMin()
diff --git a/katana/src/GlobalRoute.cpp b/katana/src/GlobalRoute.cpp
index cee3fee5..6cbff892 100644
--- a/katana/src/GlobalRoute.cpp
+++ b/katana/src/GlobalRoute.cpp
@@ -150,7 +150,7 @@ namespace Katana {
     annotateGlobalGraph();
 
     startMeasures();
-    cmess1 << "  o  Running global routing..." << endl;
+    cmess1 << "  o  Running global routing." << endl;
 
     float edgeHInc = getConfiguration()->getEdgeHInc();
 
@@ -198,10 +198,10 @@ namespace Katana {
       dijkstra->setSearchAreaHalo( Session::getSliceHeight()*3 );
 
       cmess2 << " ripup:" << setw(4) << netCount << right;
-      stopMeasures();
+      suspendMeasures();
       cmess2 << " " << setw(10) << Timer::getStringTime  (getTimer().getCombTime())
              << " " << setw( 6) << Timer::getStringMemory(getTimer().getIncrease()) << endl;
-      startMeasures();
+      resumeMeasures();
 
       ++iteration;
     } while ( (netCount > 0) and (iteration < 5) );
diff --git a/stratus1/src/stratus/stratus.py b/stratus1/src/stratus/stratus.py
index aa1afb13..abf0f85c 100644
--- a/stratus1/src/stratus/stratus.py
+++ b/stratus1/src/stratus/stratus.py
@@ -32,6 +32,7 @@ try:
   print '     - Netlist format: <%s>.' % Cfg.getParamString('stratus1.format').asString()
   print '     - Simulator: <%s>.'      % Cfg.getParamString('stratus1.simulator').asString()
   
+  from Hurricane        import UpdateSession
   from st_model         import *
   from st_net           import *
   from st_instance      import *
@@ -82,6 +83,7 @@ def buildModel ( moduleName, flags, className=None, modelName=None, parameters={
           print '[ERROR] Stratus module <%s> do not contains a design named <%s>.' % (moduleName,className)
           sys.exit(1)
 
+      UpdateSession.open()
       print '     - Generating Stratus Model <%s> (generator:<%s>).' % (modelName, className)
       model = module.__dict__[className](modelName,parameters)
       model.Interface()
@@ -93,6 +95,7 @@ def buildModel ( moduleName, flags, className=None, modelName=None, parameters={
       if flags & DoStop: stopLevel = 1
       model.View(stopLevel, 'Model %s' % modelName)
       model.Save(LOGICAL|PHYSICAL)
+      UpdateSession.close()
 
     except ImportError, e:
       module = str(e).split()[-1]