The WPF forum is being attacked by spammers who are trying to create accounts. I just rejected 2500 new user requests.
In an attempt to combat these spammers, I have added some new mandatory fields for registrants. You must now tell us your real name, your country, and write a short paragraph on why you wish to join these forums.
If you are already using these forums, I highly recommend going to your “Edit Profile” page and adding that information. We may at some point decide to purge inactive users who do not have that field filled out.
We may also start using more active anti-spam techniques in the future.