The Sims 3 (Seasons) keeps asking me for a registration code [ Edited ]

[elinevh]

Hello,

I installed Origin (and registered my games) for a new-bought expansion pack (The Sims 3 Seasons). Everything went well (Origin recognizes my registration code and previous games) until I wanted to push the play button (Launcher). An EA screen popped up, asking me for my registration code (again). When I fill it in, it keeps asking me. I googled my problem, and it seems a lot of people have the same problem. I've read the url's you've been giving to people with a similar problem, (like this one: http://answers.ea.com/t5/The-Sims-3/FAQ-Invalid-and-Used-Serial-Codes-amp-Games-not-showing-up-in/td...but they don't apply to me.

I also tried to delete all of the Sims software, and install it again - but it won't work. I can play The Sims 3 (basic) however. Is there a simple solution for this?
 I chatted with an EA-helpdesk, and they gave me a link to install the latest update (did that, but didn't solve the problem) and checked my code for me (everything seemed fine).

Thanks.

(PS: this is a screenshot from the screen that keeps popping up: http://www.flickr.com/photos/95378405@N04/9266319703/)

[EA_Spectre]

Did you put in the registration code for Seasons or that from the base game?