diff --git a/invesalius/data/slice_.py b/invesalius/data/slice_.py
index 7b24943..ff7a991 100644
--- a/invesalius/data/slice_.py
+++ b/invesalius/data/slice_.py
@@ -157,6 +157,8 @@ class Slice(object):
 
     def __set_current_mask_threshold(self, evt_pubsub):
         session = ses.Session()
+        print session.project_status != const.PROJ_OPEN
+        print session.project_status
         #FIXME: find a better way to implement this
         if (self.num_gradient >= 2) or \
         (session.project_status != const.PROJ_OPEN):
@@ -275,11 +277,6 @@ class Slice(object):
        
         proj = Project()
         proj.mask_dict[self.current_mask.index].threshold_range = threshold_range
-   
-        session = ses.Session()
-        session.ChangeProject()
-
-
  
 
     def ShowMask(self, index, value):
diff --git a/invesalius/gui/task_slice.py b/invesalius/gui/task_slice.py
index 16aa810..7a78c50 100644
--- a/invesalius/gui/task_slice.py
+++ b/invesalius/gui/task_slice.py
@@ -31,6 +31,7 @@ import gui.widgets.foldpanelbar as fpb
 import widgets.colourselect as csel
 
 from project import Project
+import session as ses
 
 BTN_NEW = wx.NewId()
 
@@ -476,6 +477,8 @@ class MaskProperties(wx.Panel):
         if self.bind_evt_gradient:
             ps.Publisher().sendMessage('Set threshold values',
                                         (thresh_min, thresh_max))
+            session = ses.Session()
+            session.ChangeProject()
 
     def OnSelectColour(self, evt):
         colour = evt.GetValue()
diff --git a/invesalius/gui/widgets/gradient.py b/invesalius/gui/widgets/gradient.py
index 98c6e69..b01e7bf 100755
--- a/invesalius/gui/widgets/gradient.py
+++ b/invesalius/gui/widgets/gradient.py
@@ -558,6 +558,7 @@ class GradientSlider(wx.Panel):
     def ChangeMinValue(self, e):
         # Why do I need to change slide min value if it has been changed for
         # the user?
+
         if not self.slided:
             self.GradientPanel.SetMinValue(int(self.SpinMin.GetValue()))
             self._GenerateEvent()
@@ -582,7 +583,9 @@ class GradientSlider(wx.Panel):
         except AttributeError:
             pass
         self.GradientPanel.SetMinValue(value)
+        self.slided = 1
         self.SpinMin.SetValue(int(value))
+        self.slided = 0
         self.GradientPanel.Refresh()
 
     def SetMaxValue(self, value):
@@ -591,7 +594,9 @@ class GradientSlider(wx.Panel):
         except AttributeError:
             pass
         self.GradientPanel.SetMaxValue(value)
+        self.slided = 1
         self.SpinMax.SetValue(int(value))
+        self.slided = 0
         self.GradientPanel.Refresh()
 
     def SetMaxRange(self, value):
--
libgit2 0.21.2