diff --git a/bin/curvecalc b/bin/curvecalc
--- a/bin/curvecalc
+++ b/bin/curvecalc
@@ -76,6 +76,7 @@ class Main(object):
 
         def setSong():
             songChoice(graph.value(session, L9['currentSong']))
+            dispatcher.send("song_has_changed")
         graph.addHandler(setSong)
         # next here, watch songChoice and patch the graph
         def songToGraph(newSong):
diff --git a/light9/curvecalc/curveview.py b/light9/curvecalc/curveview.py
--- a/light9/curvecalc/curveview.py
+++ b/light9/curvecalc/curveview.py
@@ -1149,6 +1149,7 @@ class Curvesetview(object):
         dispatcher.connect(self.clear_curves, "clear_curves")
         dispatcher.connect(self.add_curve, "add_curve", sender=self.curveset)
         dispatcher.connect(self.set_featured_curves, "set_featured_curves")
+        dispatcher.connect(self.song_has_changed, "song_has_changed")
         
         self.newcurvename = gtk.EntryBuffer("", 0)
 
@@ -1163,6 +1164,9 @@ class Curvesetview(object):
         """curveset is about to re-add all new curves"""
         while self.allCurveRows:
             self.allCurveRows.pop().destroy()
+
+    def song_has_changed(self):
+        self.zoomControl.redrawzoom()
         
     def takeFocus(self, *args):
         """the whole curveset's eventbox is what gets the focus, currently, so