--- /Users/kevin/Desktop/calltips/calltip_w-orig.py	2017-12-18 23:53:56.000000000 -0500
+++ /Users/kevin/Desktop/calltips/calltip_w.py	2018-08-01 06:52:18.000000000 -0400
@@ -72,6 +72,7 @@
                            background="#ffffe0", relief=SOLID, borderwidth=1,
                            font = self.widget['font'])
         self.label.pack()
+        tw.update_idletasks() #workaround for issue #34275 on macOS
         tw.lift()  # work around bug in Tk 8.5.18+ (issue #24570)
 
         self.checkhideid = self.widget.bind(CHECKHIDE_VIRTUAL_EVENT_NAME,