Index: MainWindow.py
===================================================================
--- MainWindow.py	(revision 28334)
+++ MainWindow.py	(working copy)
@@ -840,10 +840,9 @@
     def _load_diff_compare_cb (self, widget=None, extra=None):
         """Loads all active scans into a dictionary, passes it to the DiffWindow
         constructor, and then displays the 'Compare Results' window."""
-        # We must change this test dict
         # This dict has the following syntax:
-        # key = Scan name
-        # value = nmap output in string format
+        # key = Unique scan name
+        # value = Parsed nmap result object
         dic = {}
 
         for parsed in self.scan_interface.inventory.get_scans():
@@ -852,8 +851,15 @@
             else:
                 scan_name = parsed.get_nmap_command()
 
-            dic[scan_name] = parsed
+            scan_id = 1
+            dic_keys = dic.keys()
+            new_scan_name = scan_name
+            while new_scan_name in dic_keys:
+                new_scan_name = "%s (%s)" % (scan_name, scan_id)
+                scan_id += 1
 
+            dic[new_scan_name] = parsed
+
         self.diff_window = DiffWindow(dic)
 
         self.diff_window.show_all()