Apparently in February, Starbucks went to Seven Stars only for honoring the four daily free drink comps.

I know that some people were getting severely limited or refused all together regardless of Tier Level depending on their specific play type, but this change apparently was made across the entire Rewards Program sometime in February. Despite living in Vegas, I don't make it there often so this is my first encounter with it. Strangely, I haven't seen anything written about this on any of the Reward's forums, but I was denied at Starbucks (as Diamond Elite) and confirmed with the Rewards Center on the way out, fwiw.