Discover Card Not Giving Cash Back at Safeway?

A few years ago, I wrote about getting Cash Back at Supermarkets using a Discover Card. I usually get my cash back from Safeway. This involves using a Discover Card in a supermarket, and then choosing cash back as a option during checkout. This is called a "cash over" option.

A couple months ago, I noticed that Discover Card no longer offers "cash over" when I pay. Have other people noticed this? I would like to hear your experiences.

PFS