I don't know if this helps, but here is how this offer works:

When you click on the special link in the email, it sets a cookie in your computer. As long as you update your profile with ANYTHING within 1 hour, the profile page will find that cookie on your computer and give you the credit instantly.

If you do that and it does NOT credit, it means that either your security settings are too high to accept the cookie or your page is not loading up all of the images completely.

The good news is that you can try it as many times as it takes until you get the credit. It's a good test for some of you who have had trouble getting credits on offers. Maybe try changing your security settings?