Starbucks App Crashing

I just tested mine and it seems to be working fine. On the Watch app I can see my rewards, the closest store, and a listing of my cards. According to my phone, going to Settings>General>Storage & iCloud Usage, then checking manage storage, the Starbucks app is version 4.2.5. Are you using that version?

Yes, they are. I always have location services on, or should I say that I have the master switch on, and for the Starbucks app I have it set for While using the App. I'll test turning it off and seeing what happens.

EDIT : I experienced the same behavior. If I turn Location Services off for the Starbuck's app, when I attempt to open the app on the phone, it will display the rewards for a second, and then close. As soon as I turned Location Services back on for the app, it opens correctly. You may wish to report this to Starbucks, so they can check their app. I will do the same.