diff --git a/invesalius/data/volume.py b/invesalius/data/volume.py
index ddebdf2..b72d20e 100755
--- a/invesalius/data/volume.py
+++ b/invesalius/data/volume.py
@@ -204,7 +204,7 @@ class Volume():
         ps.Publisher().sendMessage('Render volume viewer')
 
     def Refresh(self, pubsub_evt):
-        self.__set_preset()
+        self.__update_colour_table()
 
 #***************
     def Create16bColorTable(self, scale):
@@ -361,15 +361,16 @@ class Volume():
 
     def ApplyConvolution(self, imagedata):
         number_filters = len(self.config['convolutionFilters'])
-        update_progress= vtk_utils.ShowProgress(number_filters)
-        for filter in self.config['convolutionFilters']:
-            convolve = vtk.vtkImageConvolve()
-            convolve.SetInput(imagedata)
-            convolve.SetKernel5x5([i/60.0 for i in Kernels[filter]])
-            convolve.AddObserver("ProgressEvent", lambda obj,evt:
-                                 update_progress(convolve, "%s ..." % filter))
-            convolve.Update()
-            imagedata = convolve.GetOutput()
+        if number_filters:
+            update_progress= vtk_utils.ShowProgress(number_filters)
+            for filter in self.config['convolutionFilters']:
+                convolve = vtk.vtkImageConvolve()
+                convolve.SetInput(imagedata)
+                convolve.SetKernel5x5([i/60.0 for i in Kernels[filter]])
+                convolve.AddObserver("ProgressEvent", lambda obj,evt:
+                                     update_progress(convolve, "%s ..." % filter))
+                convolve.Update()
+                imagedata = convolve.GetOutput()
         return imagedata
 
     def LoadVolume(self):
diff --git a/invesalius/gui/default_viewers.py b/invesalius/gui/default_viewers.py
index 1bafeb3..262b288 100755
--- a/invesalius/gui/default_viewers.py
+++ b/invesalius/gui/default_viewers.py
@@ -24,7 +24,8 @@ import wx.lib.pubsub as ps
 import data.viewer_slice as slice_viewer
 import data.viewer_volume as volume_viewer
 
-from gui.widgets.clut_raycasting import CLUTRaycastingWidget
+from gui.widgets.clut_raycasting import CLUTRaycastingWidget, \
+        EVT_CLUT_POINT_CHANGED
 
 class Panel(wx.Panel):
     def __init__(self, parent):
@@ -192,7 +193,7 @@ class VolumeInteraction(wx.Panel):
         #sizer = wx.BoxSizer(wx.HORIZONTAL)
         #sizer.Add(volume_viewer.Viewer(self), 1, wx.EXPAND|wx.GROW)
         #self.SetSizer(sizer)
-        #self.__bind_events_wx()
+        self.__bind_events_wx()
         #sizer.Fit(self)
 
     def __init_aui_manager(self):
@@ -229,10 +230,13 @@ class VolumeInteraction(wx.Panel):
         self.aui_manager.Update()
 
     def __bind_events_wx(self):
+        self.clut_raycasting.Bind(EVT_CLUT_POINT_CHANGED, self.OnPointChanged)
         #self.Bind(wx.EVT_SIZE, self.OnSize)
         #self.Bind(wx.EVT_MAXIMIZE, self.OnMaximize)
-        pass
 
+    def OnPointChanged(self, evt):
+        ps.Publisher.sendMessage('Set raycasting refresh', None)
+        ps.Publisher().sendMessage('Render volume viewer', None)     
 
 import wx.lib.platebtn as pbtn
 import wx.lib.buttons as btn
--
libgit2 0.21.2