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We are having problems running some python code that worked well in previous binary versions of QGIS. Example code below:

import gdal
fid = gdal.Open('tenbytenraster.asc', gdal.GA_ReadOnly)
band = fid.GetRasterBand(1)
array = band.ReadAsArray()

Under Lisboa, the code above runs fine. Under Dufour we get an error like this:

>>> import gdal
>>> id = gdal.Open('tenbytenraster.asc', gdal.GA_ReadOnly)
>>> fid = gdal.Open('tenbytenraster.asc', gdal.GA_ReadOnly)
>>> band = fid.GetRasterBand(1)
>>> array = band.ReadAsArray()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "C:\\Program Files\\QGIS Dufour\\apps\\Python27\\lib\\site-packages\\osgeo\\gdal.py", line 1026, in ReadAsArray
    import gdalnumeric
  File "C:\\Program Files\\QGIS Dufour\\apps\\Python27\\lib\\site-packages\\osgeo\\gdalnumeric.py", line 1, in <module>
    from gdal_array import *
  File "C:\\Program Files\\QGIS Dufour\\apps\\Python27\\lib\\site-packages\\osgeo\\gdal_array.py", line 26, in <module>
    _gdal_array = swig_import_helper()
  File "C:\\Program Files\\QGIS Dufour\\apps\\Python27\\lib\\site-packages\\osgeo\\gdal_array.py", line 18, in swig_import_helper
    import _gdal_array
ImportError: No module named _gdal_array
>>>

After a bit of investigation, it seems that various python modules are missing in the Win Standalone installer. The attached image illustrates that that in the lisboa installation (on the left) gdal_array (and other) libs are present, whilst in Dufour they are absent.

Note: This problem may be present with the 32bit version of the installer too, we have not tested it yet.