diff --git a/invesalius/gui/frame.py b/invesalius/gui/frame.py
index b34e286..68ce16d 100644
--- a/invesalius/gui/frame.py
+++ b/invesalius/gui/frame.py
@@ -128,7 +128,6 @@ class Frame(wx.Frame):
         # Create aui manager and insert content in it
         self.__init_aui()
 
-        self.preferences = preferences.Preferences(self)
         # Initialize bind to pubsub events
         self.__bind_events()
         self.__bind_events_wx()
@@ -580,12 +579,13 @@ class Frame(wx.Frame):
         self.mw.SetPosition(pos)
 
     def ShowPreferences(self):
+        preferences_dialog = preferences.Preferences(None)
+        preferences_dialog.LoadPreferences()
+        preferences_dialog.Center()
 
-        self.preferences.Center()
-        
-        if self.preferences.ShowModal() == wx.ID_OK:
-            values = self.preferences.GetPreferences()
-            self.preferences.Close()
+        if preferences_dialog.ShowModal() == wx.ID_OK:
+            values = preferences_dialog.GetPreferences()
+            preferences_dialog.Destroy()
 
             ses.Session().rendering = values[const.RENDERING]
             ses.Session().surface_interpolation = values[const.SURFACE_INTERPOLATION]
diff --git a/invesalius/gui/preferences.py b/invesalius/gui/preferences.py
index 1dc0564..5443752 100644
--- a/invesalius/gui/preferences.py
+++ b/invesalius/gui/preferences.py
@@ -17,8 +17,7 @@ class Preferences(wx.Dialog):
     def __init__( self, parent, id = ID, title = _("Preferences"), size=wx.DefaultSize,\
                                 pos=wx.DefaultPosition, style=wx.DEFAULT_DIALOG_STYLE | wx.RESIZE_BORDER):
 
-        wx.Dialog.__init__(self, parent, ID, title, pos, size, style)
-        self.SetExtraStyle(wx.DIALOG_EX_CONTEXTHELP)
+        wx.Dialog.__init__(self, parent, id, title, pos, size, style)
 
         sizer = wx.BoxSizer(wx.VERTICAL)
 
@@ -44,16 +43,7 @@ class Preferences(wx.Dialog):
         line = wx.StaticLine(self, -1, size=(20,-1), style=wx.LI_HORIZONTAL)
         sizer.Add(line, 0, wx.GROW|wx.ALIGN_CENTER_VERTICAL|wx.RIGHT|wx.TOP, 5)
 
-        btnsizer = wx.StdDialogButtonSizer()
-
-        btn = wx.Button(self, wx.ID_OK)
-        btnsizer.AddButton(btn)
-
-        btn = wx.Button(self, wx.ID_CANCEL)
-        btnsizer.AddButton(btn)
-
-        btnsizer.Realize()
-
+        btnsizer = self.CreateStdDialogButtonSizer(wx.OK | wx.CANCEL)
         sizer.Add(btnsizer, 0, wx.GROW|wx.ALIGN_CENTER_VERTICAL|wx.RIGHT|wx.TOP|wx.BOTTOM, 5)
 
         self.SetSizer(sizer)
@@ -64,7 +54,6 @@ class Preferences(wx.Dialog):
     def __bind_events(self):
         Publisher.subscribe(self.LoadPreferences, 'Load Preferences')
 
-
     def GetPreferences(self):
         values = {}
         lang = self.pnl_language.GetSelection()
diff --git a/invesalius/gui/task_exporter.py b/invesalius/gui/task_exporter.py
index 0fe48b9..d1c204f 100644
--- a/invesalius/gui/task_exporter.py
+++ b/invesalius/gui/task_exporter.py
@@ -18,6 +18,7 @@
 #--------------------------------------------------------------------------
 
 import os
+import pathlib
 import sys
 
 import wx
@@ -317,9 +318,9 @@ class InnerTaskPanel(wx.Panel):
 
         if n_surface:
             if sys.platform == 'win32':
-                project_name = project.name
+                project_name = pathlib.Path(project.name).stem
             else:
-                project_name = project.name+".stl"
+                project_name = pathlib.Path(project.name).stem + ".stl"
 
             session = ses.Session()
             last_directory = session.get('paths', 'last_directory_3d_surface', '')
--
libgit2 0.21.2