Having the same issue too. It seems more of a google wallet connection problem. Yesterday, I couldn't add my citi mastercard nor the google prepaid. It would just hang at "Adding card..." for up to 15 minutes or more. Then late in the night, I was able to add the google prepaid, but still haven't been able to add the citi mastercard. I called citi mastercard and they said they have heard from quite a few that are having the same issue. But didn't know what it was and to wait a few days. I also called google wallet and they don't know either. I think it has to do with a connection issue to google wallet from all the new activations. People are probably pounding google wallet.
I also have added the cards last week, I just had to reset google wallet so I could factory reset.
This issue has nothing to do with the sticky by the way.