It shouldn't sum the groupby'd col (in fact index col should be the index, if groupby as_index).
In [13]: df = pd.DataFrame([[1, 2, np.nan], [1, np.nan, 9], [3, 4, 9]], columns=['A', 'B', 'C'])
In [14]: g = df.groupby('A')
In [16]: g.cumsum()
Out[16]:
A B C
0 1 2 NaN
1 2 NaN 9
2 3 4 9
[3 rows x 3 columns]
Nature of it being dispatch. Should fix up for 0.14 possibly along with some other whitelisted groupby functions.
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