[SciPy-User] Warnings --- why do they occur and how can I stop them?

[Virgil Stokes]

I have the following installed:

   NumPy 1.6.1
   SciPy 0.11.0

on a Windows Vista (32-bit) platform with Python 2.7

I get the following warnings:

D:\python27\lib\site-packages\scipy\io\matlab\mio4.py:15: RuntimeWarning: 
numpy.dtype size changed, may indicate binary incompatibility
       from mio_utils import squeeze_element, chars_to_strings
D:\python27\lib\site-packages\scipy\io\matlab\mio4.py:15: RuntimeWarning: 
numpy.ufunc size changed, may indicate binary incompatibility
       from mio_utils import squeeze_element, chars_to_strings
D:\python27\lib\site-packages\scipy\io\matlab\mio5.py:96: RuntimeWarning: 
numpy.dtype size changed, may indicate binary incompatibility
       from mio5_utils import VarReader5
D:\python27\lib\site-packages\scipy\io\matlab\mio5.py:96: RuntimeWarning: 
numpy.ufunc size changed, may indicate binary incompatibility
       from mio5_utils import VarReader5

  When the following statement is executed

from scipy import io

Why does this occur and what can be done to fix this problem?