diff --git a/invesalius/control.py b/invesalius/control.py
index ce848db..23f962b 100755
--- a/invesalius/control.py
+++ b/invesalius/control.py
@@ -33,6 +33,7 @@ import reader.dicom_grouper as dg
 import gui.dialogs as dialog
 import reader.dicom_reader as dcm
 import reader.analyze_reader as analyze
+import session
 
 DEFAULT_THRESH_MODE = 0
 
@@ -45,7 +46,8 @@ class Controller():
         self.frame = frame
         self.progress_dialog = None
         self.cancel_import = False
-
+        #Init session
+        session.Session()
 
     def __bind_events(self):
         ps.Publisher().subscribe(self.OnImportMedicalImages, 'Import directory')
@@ -271,11 +273,11 @@ class Controller():
             prj.Project().name = filename
         prj.Project().path = filename
         prj.Project().SavePlistProject(dir_, filename)
+        session.Session().project_status = const.SAVE_PROJECT
 
     def OnOpenProject(self, pubsub_evt):
         filename = os.path.abspath(pubsub_evt.data)
-        
-        
+        session.Session().project_status = const.OPEN_PROJECT
         proj = prj.Project()
         proj.OpenPlistProject(filename)
         proj.SetAcquisitionModality(proj.modality)
@@ -285,5 +287,4 @@ class Controller():
         const.THRESHOLD_INVALUE = proj.threshold_range[1]
         const.WINDOW_LEVEL['Default'] = (proj.window, proj.level)
         const.WINDOW_LEVEL['Manual'] = (proj.window, proj.level)
-
-        self.LoadProject()
+        self.LoadProject()
\ No newline at end of file
diff --git a/invesalius/data/slice_.py b/invesalius/data/slice_.py
index 6c29ae8..c50ef71 100644
--- a/invesalius/data/slice_.py
+++ b/invesalius/data/slice_.py
@@ -25,6 +25,7 @@ import constants as const
 import imagedata_utils as iu
 from mask import Mask
 from project import Project
+import session
 from utils import Singleton
 
 
@@ -115,7 +116,10 @@ class Slice(object):
 
     def __set_current_mask_threshold(self, evt_pubsub):
         #FIXME: find a better way to implement this
-        if (self.num_gradient >= 2):
+        print session.Session().project_status
+        if (self.num_gradient >= 2) or \
+        (session.Session().project_status != const.OPEN_PROJECT):
+            print "ENTROU........................................................"
             threshold_range = evt_pubsub.data
             index = self.current_mask.index
             self.SetMaskThreshold(index, threshold_range)
diff --git a/invesalius/project.py b/invesalius/project.py
index de3795c..57b9533 100755
--- a/invesalius/project.py
+++ b/invesalius/project.py
@@ -110,6 +110,7 @@ class Project(object):
         print self.invesalius_version
         
         self.save_as = True
+     
         self.path = ""
         self.debug = 0
 
diff --git a/invesalius/reader/dicom_reader.py b/invesalius/reader/dicom_reader.py
index 3ef99f6..cc36bf5 100644
--- a/invesalius/reader/dicom_reader.py
+++ b/invesalius/reader/dicom_reader.py
@@ -32,6 +32,7 @@ import constants as const
 import dicom
 import dicom_grouper
 import data.imagedata_utils as iu
+import session
 
 def ReadDicomGroup(dir_):
     
@@ -40,6 +41,7 @@ def ReadDicomGroup(dir_):
         filelist, dicom, zspacing = SelectLargerDicomGroup(patient_group)
         filelist = SortFiles(filelist, dicom)
         imagedata = CreateImageData(filelist, zspacing)
+        session.Session().project_status = const.NEW_PROJECT
         return imagedata, dicom
     else:
         return False
--
libgit2 0.21.2