import pandas hanging Flask 0.11.1 / Apache 2.4.18
pandas 0.19.1 is hanging apache on the import in the python script, the website times out. Downgrading to 0.18.1 resolves the issue. Tested this on a fresh EC2 instance Ubuntu 16.04.

 
Apache log:
- [Sat Nov 12 03:05:18.784672 2016] [core:warn] [pid 23426:tid 139710063925120] AH00045: child process 23563 still did not exit, sending a SIGTERM
- [Sat Nov 12 03:05:20.786946 2016] [core:warn] [pid 23426:tid 139710063925120] AH00045: child process 23563 still did not exit, sending a SIGTERM
- [Sat Nov 12 03:05:22.789238 2016] [core:warn] [pid 23426:tid 139710063925120] AH00045: child process 23563 still did not exit, sending a SIGTERM
- [Sat Nov 12 03:05:24.791547 2016] [core:error] [pid 23426:tid 139710063925120] AH00046: child process 23563 still did not exit, sending a SIGKILL

<details>

INSTALLED VERSIONS
------------------
commit: None
python: 2.7.12.final.0
python-bits: 64
OS: Linux
OS-release: 4.4.0-45-generic
machine: x86_64
processor: x86_64
byteorder: little
LC_ALL: None
LANG: en_US.UTF-8
LOCALE: None.None

pandas: 0.19.1
nose: None
pip: 9.0.1
setuptools: 28.8.0
Cython: None
numpy: 1.11.2
scipy: None
statsmodels: None
xarray: None
IPython: None
sphinx: None
patsy: None
dateutil: 2.6.0
pytz: 2016.7
blosc: None
bottleneck: None
tables: None
numexpr: None
matplotlib: None
openpyxl: None
xlrd: None
xlwt: None
xlsxwriter: None
lxml: None
bs4: None
html5lib: None
httplib2: None
apiclient: None
sqlalchemy: None
pymysql: None
psycopg2: None
jinja2: 2.8
boto: None
pandas_datareader: None

</details>
