Fixed multi-arg appends.
diff --git a/Mac/Tools/IDE/PythonIDEMain.py b/Mac/Tools/IDE/PythonIDEMain.py
index 69223f5..a340eef 100644
--- a/Mac/Tools/IDE/PythonIDEMain.py
+++ b/Mac/Tools/IDE/PythonIDEMain.py
@@ -204,7 +204,7 @@
 			title = window.GetWTitle()
 			if not title:
 				title = "<no title>"
-			windows.append(title, window)
+			windows.append((title, window))
 		windows.sort()
 		for title, window in windows:
 			if title == "Python Interactive":	# ugly but useful hack by Joe Strout
diff --git a/Mac/Tools/IDE/Wbase.py b/Mac/Tools/IDE/Wbase.py
index 46a8c96..e1e71b2 100644
--- a/Mac/Tools/IDE/Wbase.py
+++ b/Mac/Tools/IDE/Wbase.py
@@ -490,7 +490,7 @@
 		for panesize in panesizes:
 			if current:
 				self._gutters.append(current)
-			self._panesizes.append(current, current + panesize)
+			self._panesizes.append((current, current + panesize))
 			current = current + panesize
 		self.makepanebounds()