When using np.newaxis, the array flags of the new array are set to say that the array is not C or Fortran contiguous, even when it should be.

For example:

import numpy as np
from numpy.random import rand
# Make an array that is C contiguous and F contiguous
A = rand(10)
A2 = A[...,np.newaxis]
print A2.flags

The flags are shown to be

C_CONTIGUOUS : False
F_CONTIGUOUS : False
OWNDATA : False
WRITEABLE : True
ALIGNED : True
UPDATEIFCOPY : False

Even though the actual memory layout of the array is both C and Fortran contiguous.

I can verify that this behavior appears on Linux and Windows installations of NumPy 1.8.