*Addendum: The invitation link isn’t needed anymore to join Class Blogs. Instead, click on the Join Here link on the homepage. However, you can still use it from your Class Blog to invite students or teachers to join your site.*
When I sent out the new invitations, I did not realize that the code was reset when I removed Buddypress from the system. So, in order to make the link work, you will need to change the link to something like below making sure to add your email address at the end. This link bypasses the need to click on a signup link, so this link will get you into the registration page and you should see the registration form when you get to this page. Sorry for the inconvenience.
http://classblogs.us/signup-dfa/?action=register&email=myemail@gmail.com

Says it doesn’t work. Can you resend me another link?
Vist the homepage and click on the Join Here link. Let me know if you are still experiencing problems.
This is the second time the link has not worked. I clicked on it two days after it was sent.
When you change it from login to signup, it will get you to the registration page without clicking on any signup link. If you are still having issues, can you forward your invitation email to support at classblogs.us? Thanks.