diff -up evolution-2.12.1/calendar/gui/dialogs/task-page.c.source-changed-event evolution-2.12.1/calendar/gui/dialogs/task-page.c
--- evolution-2.12.1/calendar/gui/dialogs/task-page.c.source-changed-event	2007-11-16 19:07:11.000000000 +0100
+++ evolution-2.12.1/calendar/gui/dialogs/task-page.c	2007-11-16 19:08:06.000000000 +0100
@@ -1837,7 +1837,7 @@ init_widgets (TaskPage *tpage)
 			    G_CALLBACK (categories_clicked_cb), tpage);
 	
 	/* Source selector */
-	g_signal_connect((priv->source_selector), "source_changed",
+	g_signal_connect((priv->source_selector), "changed",
 			 G_CALLBACK (source_changed_cb), tpage);
 
 	/* Connect the default signal handler to use to make sure the "changed"