diff -r 43739c16a002 -r 5cd1f8df71aa controls/DebugVariablePanel.py
--- a/controls/DebugVariablePanel.py	Thu May 02 14:00:05 2013 +0200
+++ b/controls/DebugVariablePanel.py	Thu May 02 14:06:24 2013 +0200
@@ -1810,6 +1810,7 @@
             self.Thaw()
         
     def UnregisterObsoleteData(self):
+        self.RegisterVariables()
         if USE_MPL:
             if self.DataProducer is not None:
                 self.Ticktime = self.DataProducer.GetTicktime()