I for one had the problem where at the last step of adding points, where you go to the paypal site to login and finish the payment, you'd get an error saying something went wrong and you should check you mail the next 30 mins etc. etc. and you don't get the points, and nothing else happens.
I fixed this by entering my country not only in the drop down menu, but also at the not required field named State/Province/Country.
I don't know, just thought I'd share this, seeing some topics on this issue.
Hope this helps someone.