Thanks. I was able to execute the provided command and this successfully changed the password and these users can now login. Very strange. The only thing I can think of as far as when I first created these users is that I first created the one user that worked, and while the permission page was open I clicked on the New Window link in the left hand nav. Then proceeded to create the other users and setting their permissions in this new window. It is these two users that were created in the new window that somehow ended up being broken.