Referencing a `normal` array element?

I just went to compile my shader (3Delight 6.5) and im getting errors
for trying to get an array element from a normal variable? I just
compiled the same shader at work with same version of 3Delight
yesterday morning and it worked fine?

    normal NN = normalize(N);
    color CN = color( NN[0], NN[1], depth(P) );

returns:

    ERROR: variable 'NN' is not an array

that should work right?

Thanks in advance