pandas multiIndex bug?

pandas_multiIndex

/usr/local/Cellar/python/2.7.3/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/pandas-0.9.1.dev_f391180-py2.7-macosx-10.8-x86_64.egg/pandas/core/indexing.pyc in __getitem__(self, key)
     39                 pass
     40 
---> 41             return self._getitem_tuple(key)
     42         else:
     43             return self._getitem_axis(key, axis=0)

/usr/local/Cellar/python/2.7.3/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/pandas-0.9.1.dev_f391180-py2.7-macosx-10.8-x86_64.egg/pandas/core/indexing.pyc in _getitem_tuple(self, tup)
    202     def _getitem_tuple(self, tup):
    203         try:
--> 204             return self._getitem_lowerdim(tup)
    205         except IndexingError:
    206             pass

/usr/local/Cellar/python/2.7.3/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/pandas-0.9.1.dev_f391180-py2.7-macosx-10.8-x86_64.egg/pandas/core/indexing.pyc in _getitem_lowerdim(self, tup)
    315                         new_key, = new_key
    316 
--> 317                 return section.ix[new_key]
    318 
    319         raise IndexingError('not applicable')

/usr/local/Cellar/python/2.7.3/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/pandas-0.9.1.dev_f391180-py2.7-macosx-10.8-x86_64.egg/pandas/core/indexing.pyc in __getitem__(self, key)
     39                 pass
     40 
---> 41             return self._getitem_tuple(key)
     42         else:
     43             return self._getitem_axis(key, axis=0)

/usr/local/Cellar/python/2.7.3/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/pandas-0.9.1.dev_f391180-py2.7-macosx-10.8-x86_64.egg/pandas/core/indexing.pyc in _getitem_tuple(self, tup)
    219                 continue
    220 
--> 221             retval = retval.ix._getitem_axis(key, axis=i)
    222 
    223         return retval

/usr/local/Cellar/python/2.7.3/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/pandas-0.9.1.dev_f391180-py2.7-macosx-10.8-x86_64.egg/pandas/core/indexing.pyc in _getitem_axis(self, key, axis)
    350             lab = key
    351             if com.is_integer(key) and not _is_integer_index(labels):
--> 352                 return self._get_loc(key, axis=axis)
    353             return self._get_label(lab, axis=axis)
    354 

/usr/local/Cellar/python/2.7.3/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/pandas-0.9.1.dev_f391180-py2.7-macosx-10.8-x86_64.egg/pandas/core/indexing.pyc in _get_loc(self, key, axis)
     56 
     57     def _get_loc(self, key, axis=0):
---> 58         return self.obj._ixs(key, axis=axis)
     59 
     60     def _slice(self, obj, axis=0):

/usr/local/Cellar/python/2.7.3/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/pandas-0.9.1.dev_f391180-py2.7-macosx-10.8-x86_64.egg/pandas/core/frame.pyc in _ixs(self, i, axis)
   1654             return self.irow(i)
   1655         else:
-> 1656             return self.icol(i)
   1657 
   1658     def iget_value(self, i, j):

/usr/local/Cellar/python/2.7.3/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/pandas-0.9.1.dev_f391180-py2.7-macosx-10.8-x86_64.egg/pandas/core/frame.pyc in icol(self, i)
   1637         column : Series (int) or DataFrame (slice, sequence)
   1638         """
-> 1639         label = self.columns[i]
   1640         if isinstance(i, slice):
   1641             # need to return view

/usr/local/Cellar/python/2.7.3/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/pandas-0.9.1.dev_f391180-py2.7-macosx-10.8-x86_64.egg/pandas/core/index.pyc in __getitem__(self, key)
    316         arr_idx = self.view(np.ndarray)
    317         if np.isscalar(key):
--> 318             return arr_idx[key]
    319         else:
    320             if com._is_bool_indexer(key):

IndexError: index out of bounds