Segmentation Fault 11 When Adding a New Empty Column
While running OS X 10.9.3 and Python 2.7.6 I get a seg fault when trying to add a new column to an existing DataFrame where the new column is initialized to an empty string ("").  When initializing to np.NaN, the fault does not occur.  An example is below.

mydataframe['new_column'] = "" <- this results in 'Segmentation Fault 11'

mydataframe['new_column'] = np.nan <- this works
