The creation of the Numeric array for the Pixbuf.pixal_array attribute has
the width and height transposed in the dimensions array.  For example:

 >>> # create a width=1, height=4 pixel, without alpha
 >>> p = gtk.gdk.Pixbuf(gtk.gdk.COLORSPACE_RGB, False, 8, 1, 4)
 >>> p.fill(0)
 >>> # get the first row
 >>> p.pixel_array[0]
 array([[0, 0, 0], [0, 0, 0], [0, 0, 0], [0, 0, 7]], 'b')

That result should have been:

 array([[0, 0, 0]], 'b')

In some situation this can even cause a segfault, as the rowstride gets
used the wrong number of times and you go off the end of the pixels array.
 I will attach a patch.