Pycharm does not show plot

Pycharm does not show plot from the following code:

    import pandas as pd
    import numpy as np
    import matplotlib as plt

    ts = pd.Series(np.random.randn(1000), index=pd.date_range('1/1/2000', periods=1000))

    ts = ts.cumsum()    

What happens is that a window appears for less than a second, and then disappears again.

Using the Pyzo IEP IDE (using same interpreter) on the same code the plot shows as expected.

...So the problem must be with some setting on Pycharm. I've tried using both python.exe and pythonw.exe as interpreter both with same results.

This is my sys_info:

    C:\pyzo2014a\pythonw.exe -u C:\Program Files (x86)\JetBrains\PyCharm Community Edition 3.4.1\helpers\pydev\ 57315 57316
    PyDev console: using IPython 2.1.0import sys; print('Python %s on %s' % (sys.version, sys.platform))
    Python 3.4.1 |Continuum Analytics, Inc.| (default, May 19 2014, 13:02:30) [MSC v.1600 64 bit (AMD64)] on win32
    In[3]: import IPython
    {'commit_hash': '681fd77',
     'commit_source': 'installation',
     'default_encoding': 'UTF-8',
     'ipython_path': 'C:\\pyzo2014a\\lib\\site-packages\\IPython',
     'ipython_version': '2.1.0',
     'os_name': 'nt',
     'platform': 'Windows-8-6.2.9200',
     'sys_executable': 'C:\\pyzo2014a\\pythonw.exe',
     'sys_platform': 'win32',
     'sys_version': '3.4.1 |Continuum Analytics, Inc.| (default, May 19 2014, '
                    '13:02:30) [MSC v.1600 64 bit (AMD64)]'}

I had the same problem. Check wether plt.isinteractive() is True. Setting it to 'False' helped for me.