Error in  html display of table with multicolumns
version: 0.11.0

with small variation of python for data analysis book:

``` python
tips = pd.read_csv("https://github.com/pydata/pydata-book/raw/master/ch08/tips.csv")
grouped = tips.groupby(['sex','smoker'])
res = grouped.agg({'tip': ['min','max','mean','std'], 'size':'sum'}) #By now, copied from the book, ~page 263-264

#New stuff
res["foo"] = res["tip", "max"] * res["tip", "mean"] 

```

The result attached (with missing line. it seems like 'sum' is part of 'foo')
![screenshot from 2013-05-15 15 10 15](https://f.cloud.github.com/assets/4340718/506658/970f92f4-bd58-11e2-9e82-7108d59c3912.png)
