Matplotlib crashes console - Anaconda 2.4.0 (64-bit) - qt

Question

After a fresh install of Anaconda 2.4.0/Python 3.5 on a 64-bit Windows 7, I can display a matplotlib window, but a brush of the mouse pointer over the window crashes ipython / python.
Python 3.5.0 |Anaconda 2.4.0 (64-bit)| (default, Oct 20 2015, 07:26:33) [MSC v.1900 64 bit (AMD64)]
Type "copyright", "credits" or "license" for more information.
? -> Introduction and overview of IPython's features.
%quickref -> Quick reference.
help -> Python's own help system.
object? -> Details about 'object', use 'object??' for extra details.
IPython 4.0.0 -- An enhanced Interactive Python.
In[1]: import matplotlib.pyplot as plt
import numpy.random
a = numpy.random.rand(500,1)
plt.plot(a)
plt.show()
Backend Qt4Agg is interactive backend. Turning interactive mode on.
Process finished with exit code -1073741819 (0xC0000005)
python3.exe, ipython.exe, and the PyCharm Ipython console all fail. Spyder Ipython console and Jupyter Qt console both can survive a matplotlib window.
All Interpreters point to the Anaconda 2.4.0 only install of python3 on the computer.
Ipython manages to get the following before a recursion limit is reached :
C:\Users\owinter\AppData\Local\Continuum\Anaconda3\ipython.exe E:\owinter\PYTHON\echo\sandbox\test_matplotlib.py
In [6]: Readline internal error
Traceback (most recent call last):
File "C:\Users\owinter\AppData\Local\Continuum\Anaconda3\lib\seadline\console\console.py", line 768, in hook_wrapper_23
res = ensure_str(readline_hook(prompt))
File "C:\Users\owinter\AppData\Local\Continuum\Anaconda3\lib\seadline\rlmain.py", line 571, in readline
self._readline_from_keyboard()
File "C:\Users\owinter\AppData\Local\Continuum\Anaconda3\lib\seadline\rlmain.py", line 536, in _readline_from_keyboard
if self._readline_from_keyboard_poll():
File "C:\Users\owinter\AppData\Local\Continuum\Anaconda3\lib\seadline\rlmain.py", line 552, in _readline_from_keyboard_poll
event = c.getkeypress()
File "C:\Users\owinter\AppData\Local\Continuum\Anaconda3\lib\seadline\console\console.py", line 524, in getkeypress
e = self.get()
File "C:\Users\owinter\AppData\Local\Continuum\Anaconda3\lib\seadline\console\console.py", line 514, in get
call_function(inputHookFunc, ())
OSError: exception: access violation reading 0x0000000000434DB8
Attached is the package list, unaltered and fresh from the Anaconda install
C:\Users\owinter>conda list
# packages in environment at C:\Users\owinter\AppData\Local\Continuu
#
alabaster 0.7.6 py35_0
anaconda 2.4.0 np110py35_0
anaconda-client 1.1.0 py35_0
argcomplete 1.0.0 py35_1
astropy 1.0.5 np110py35_1
babel 2.1.1 py35_0
beautifulsoup4 4.4.1 py35_0
bitarray 0.8.1 py35_1
blaze 0.8.3 <pip>
blaze-core 0.8.3 py35_0
bokeh 0.10.0 py35_0
boto 2.38.0 py35_0
bzip2 1.0.6 vc14_2 [vc14]
cffi 1.2.1 py35_0
clyent 0.4.0 py35_0
colorama 0.3.3 py35_0
comtypes 1.1.2 py35_0
conda 3.18.3 py35_0
conda-build 1.18.1 py35_0
conda-env 2.4.4 py35_0
configobj 5.0.6 py35_0
console_shortcut 0.1.1 py35_1
cryptography 1.0.2 py35_0
curl 7.45.0 vc14_0 [vc14]
cython 0.23.4 py35_0
cytoolz 0.7.4 py35_0
datashape 0.4.7 np110py35_1
decorator 4.0.4 py35_0
docutils 0.12 py35_1
fastcache 1.0.2 py35_0
flask 0.10.1 py35_1
freetype 2.5.5 vc14_0 [vc14]
greenlet 0.4.9 py35_0
h5py 2.5.0 np110py35_4
hdf5 1.8.15.1 vc14_3 [vc14]
idna 2.0 py35_0
ipykernel 4.1.1 py35_0
ipython 4.0.0 py35_1
ipython-genutils 0.1.0 <pip>
ipython-notebook 4.0.4 py35_3
ipython-qtconsole 4.0.1 py35_4
ipython_genutils 0.1.0 py35_0
ipywidgets 4.1.0 py35_0
itsdangerous 0.24 py35_0
jdcal 1.0 py35_0
jedi 0.9.0 py35_0
jinja2 2.8 py35_0
jpeg 8d vc14_0 [vc14]
jsonschema 2.4.0 py35_0
jupyter 1.0.0 py35_0
jupyter-client 4.1.1 <pip>
jupyter-console 4.0.3 <pip>
jupyter-core 4.0.6 <pip>
jupyter_client 4.1.1 py35_0
jupyter_console 4.0.3 py35_0
jupyter_core 4.0.6 py35_0
launcher 1.0.0 4
libpng 1.6.17 vc14_1 [vc14]
libsodium 1.0.3 0
libtiff 4.0.6 vc14_0 [vc14]
lxml 3.4.4 py35_0
markupsafe 0.23 py35_0
matplotlib 1.4.3 np110py35_3
menuinst 1.2.1 py35_0
mistune 0.7.1 py35_0
msvc_runtime 1.0.0 vc14_0 [vc14]
multipledispatch 0.4.8 py35_0
nbconvert 4.0.0 py35_0
nbformat 4.0.1 py35_0
networkx 1.10 py35_0
nltk 3.1 py35_0
node-webkit 0.10.1 0
nose 1.3.7 py35_0
notebook 4.0.6 py35_0
numexpr 2.4.4 np110py35_0
numpy 1.10.1 py35_0
odo 0.3.4 py35_0
openpyxl 2.2.6 py35_0
openssl 1.0.2d vc14_0 [vc14]
pandas 0.17.0 np110py35_0
path.py 8.1.2 py35_0
patsy 0.4.0 np110py35_0
pep8 1.6.2 py35_0
pickleshare 0.5 py35_0
pillow 3.0.0 py35_1
pip 7.1.2 py35_0
ply 3.8 py35_0
psutil 3.2.2 py35_0
py 1.4.30 py35_0
pyasn1 0.1.9 py35_0
pycosat 0.6.1 py35_0
pycparser 2.14 py35_0
pycrypto 2.6.1 py35_3
pycurl 7.19.5.1 py35_1
pyflakes 1.0.0 py35_0
pygments 2.0.2 py35_0
pyopenssl 0.15.1 py35_1
pyparsing 2.0.3 py35_0
pyqt 4.11.4 py35_2
pyreadline 2.1 py35_0
pytables 3.2.2 np110py35_1
pytest 2.8.1 py35_0
python 3.5.0 2
python-dateutil 2.4.2 py35_0
pytz 2015.6 py35_0
pywin32 219 py35_1
pyyaml 3.11 py35_2
pyzmq 14.7.0 py35_1
qt 4.8.7 vc14_4 [vc14]
qtconsole 4.1.0 py35_0
requests 2.8.1 py35_0
rope 0.9.4 py35_1
rope-py3k-0.9.4 1 <pip>
scikit-image 0.11.3 np110py35_0
scikit-learn 0.16.1 np110py35_0
scipy 0.16.0 np110py35_0
setuptools 18.4 py35_0
simplegeneric 0.8.1 py35_0
sip 4.16.9 py35_1
six 1.10.0 py35_0
snowballstemmer 1.2.0 py35_0
sockjs-tornado 1.0.1 py35_0
sphinx 1.3.1 py35_0
sphinx-rtd-theme 0.1.7 <pip>
sphinx_rtd_theme 0.1.7 py35_0
spyder 2.3.7 py35_3
spyder-app 2.3.7 py35_0
sqlalchemy 1.0.9 py35_0
statsmodels 0.6.1 np110py35_0
sympy 0.7.6.1 py35_0
tables 3.2.2 <pip>
tk 8.5.18 vc14_0 [vc14]
toolz 0.7.4 py35_0
tornado 4.2.1 py35_1
traitlets 4.0.0 py35_0
ujson 1.33 py35_0
unicodecsv 0.14.1 py35_0
werkzeug 0.10.4 py35_0
wheel 0.26.0 py35_1
xlrd 0.9.4 py35_0
xlsxwriter 0.7.7 py35_0
xlwings 0.4.1 py35_0
xlwt 1.0.0 py35_0
zeromq 4.1.3 vc14_1 [vc14]
zlib 1.2.8 vc14_2 [vc14]

Answer 1

By digging further I found out there was conflicting Qt libraries in this Anaconda install :
Cannot mix incompatible Qt library (version 0x40807) with this library (version 0x40804)
Next step was to look for the conflicting libraries in the command window:
where QtGui*.dll
Then uninstall or remove from the path environment variable the softwares responsible.