diff -r 2fdf57d0ce51 -r 591ba4003d74 graphics/LD_Objects.py
--- a/graphics/LD_Objects.py	Wed Jun 03 14:57:10 2009 +0200
+++ b/graphics/LD_Objects.py	Wed Jun 03 16:59:29 2009 +0200
@@ -410,7 +410,8 @@
         self.PreviousValue = self.Value
         self.Value = value
         if self.Value != self.PreviousValue:
-            self.Parent.UpdateRefreshRect(self.GetRedrawRect())
+            if self.Visible:
+                self.Parent.UpdateRefreshRect(self.GetRedrawRect())
             self.SpreadCurrent()
     
     def SpreadCurrent(self):
@@ -716,7 +717,7 @@
                 self.Output.SpreadCurrent(True)
             elif not self.Value and self.PreviousValue:
                 self.Output.SpreadCurrent(False)
-            if self.Value != self.PreviousValue:
+            if self.Value != self.PreviousValue and self.Visible:
                 self.Parent.UpdateRefreshRect(self.GetRedrawRect())
     
     # Make a clone of this LD_Coil