Error reading CALIOP level 2 Day_Night_Flag

[sofstef]

Using read_data to access the day_night flag for a CALIOP level 2 swath like this:
test_dn = cis.read_data(some_file, 'Day_Night_Flag')

throws this:

`ValueError Traceback (most recent call last)
in
----> 1 test_dn.data

~/miniconda/envs/eda/lib/python3.7/site-packages/cis/data_io/ungridded_data.py in data(self)
280 for manager in self._data_manager[1:]:
281 self._data = ma.concatenate((self._data, self.retrieve_raw_data(manager)), axis=0)
--> 282 self._post_process()
283 except MemoryError:
284 raise MemoryError(

~/miniconda/envs/eda/lib/python3.7/site-packages/cis/data_io/ungridded_data.py in _post_process(self)
477 combined_mask = numpy.zeros(self._data.shape, dtype=bool).flatten()
478 for coord in self._coords:
--> 479 combined_mask |= numpy.ma.getmaskarray(coord.data).flatten()
480 if coord.data.dtype != 'object':
481 combined_mask |= numpy.isnan(coord.data).flatten()

ValueError: operands could not be broadcast together with shapes (3728,) (1487472,) (3728,) `

The strange thing is that if I just reload a jupyter cell with test_dn.data it sometimes returns the flag data without any complaints and other times it just fails. It always fails within a function though.