Mine did that too...seemed to take a bit too long to add. I didn't let it go for too long...maybe 2-3 minutes. Then I backed out of the "Loading" screen, went back to view the cards, and it was there.
I used wallet over weekend for the first time since January. I went to my local Sports Authority to pick up some gear and I noticed they had the Paypass logo at the checkout. I thought what better time than now to try this out again since I just got it all set up again?
To be honest, I was a little nervous. The line behind me was huge and I didn't want to look like a total jackass on his phone. Anyway, I got to the front of the line, the cashier rang me up, I calmly unlocked wallet and touched it to the pad and.....vibration....and....SUCCESS!
The cashier looked at me like WTF did you just do, as my receipt printed. She looked at it with a glazed over look and handed it to me. I heard a couple people behind me ask, "Did he just pay with his phone?" Awesome