initial login URL not working on an Octopus OA install

I installed Barracuda on my Linode running 10.04 64bit with no errors, and used the one-time login URL to create the admin password with no problems. Then installed Octopus and this one-time login worked flawlessly as well. I then created an OA site with the default "admin" client. The one-time login URL takes me to the normal OA login dialog, not the reset password dialog I expect to see. So, I try to log into OA with my admin user and password but it doesn't work. I tried creating a new client with a different email address and reset the password, same problem.

Can anyone tell me what I'm doing wrong?

Thanks!