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Thank you for the report. There does seem to be a regression in the 3.3 version of IDLE. Using the OS X version of bin/idle3.3 and selecting menu item File -> Path Browser results in the following exception:
Exception in Tkinter callback
Traceback (most recent call last):
 File "/Library/Frameworks/Python.framework/Versions/3.3/lib/python3.3/tkinter/__init__.py", line 1442, in __call__
 return self.func(*args)
 File "/Library/Frameworks/Python.framework/Versions/3.3/lib/python3.3/idlelib/TreeWidget.py", line 131, in expand
 self.update()
 File "/Library/Frameworks/Python.framework/Versions/3.3/lib/python3.3/idlelib/TreeWidget.py", line 164, in update
 self.parent.update()
 File "/Library/Frameworks/Python.framework/Versions/3.3/lib/python3.3/idlelib/TreeWidget.py", line 170, in update
 self.draw(7, 2)
 File "/Library/Frameworks/Python.framework/Versions/3.3/lib/python3.3/idlelib/TreeWidget.py", line 197, in draw
 cy = child.draw(cx, cy)
 File "/Library/Frameworks/Python.framework/Versions/3.3/lib/python3.3/idlelib/TreeWidget.py", line 184, in draw
 sublist = self.item._GetSubList()
 File "/Library/Frameworks/Python.framework/Versions/3.3/lib/python3.3/idlelib/TreeWidget.py", line 338, in _GetSubList
 sublist = self.GetSubList()
 File "/Library/Frameworks/Python.framework/Versions/3.3/lib/python3.3/idlelib/PathBrowser.py", line 61, in GetSubList
 for nn, name in self.listmodules(names):
 File "/Library/Frameworks/Python.framework/Versions/3.3/lib/python3.3/idlelib/PathBrowser.py", line 78, in listmodules
 for suff, mode, flag in suffixes:
ValueError: too many values to unpack (expected 3)