diff --git a/invesalius/gui/frame.py b/invesalius/gui/frame.py
index fa1907e..458e994 100644
--- a/invesalius/gui/frame.py
+++ b/invesalius/gui/frame.py
@@ -68,6 +68,7 @@ class Frame(wx.Frame):
         if sys.platform != 'darwin':
             self.Maximize()
         
+        self.sizeChanged = True
         #Necessary update AUI (statusBar in special)
         #when maximized in the Win 7 and XP
         self.SetSize(self.GetSize())
@@ -114,6 +115,7 @@ class Frame(wx.Frame):
         Bind normal events from wx (except pubsub related).
         """
         self.Bind(wx.EVT_SIZE, self.OnSize)
+        self.Bind(wx.EVT_IDLE, self.OnIdle)
         self.Bind(wx.EVT_MENU, self.OnMenuClick)
         self.Bind(wx.EVT_CLOSE, self.OnClose)
 
@@ -375,8 +377,17 @@ class Frame(wx.Frame):
         """
         Refresh GUI when frame is resized.
         """
-        Publisher.sendMessage(('ProgressBar Reposition'))
         evt.Skip()
+        self.Reposition()
+        self.sizeChanged = True
+
+    def OnIdle(self, evt):
+        if self.sizeChanged:
+            self.Reposition()
+
+    def Reposition(self):
+        Publisher.sendMessage(('ProgressBar Reposition'))
+        self.sizeChanged = False
 
     def ShowPreferences(self):
 
@@ -691,9 +702,10 @@ class ProgressBar(wx.Gauge):
         """
         Compute new size and position, according to parent resize
         """
-        rect = self.parent.GetFieldRect(2)
+        rect = self.Parent.GetFieldRect(2)
         self.SetPosition((rect.x + 2, rect.y + 2))
         self.SetSize((rect.width - 4, rect.height - 4))
+        self.Show()
 
     def SetPercentage(self, value):
         """
--
libgit2 0.21.2