Drupal 7 + OpenID: First Attempt

So it worked, but with caveats. Here's what worked:

• associating exiting account with Google profile for OpenID (e.g. https://profiles.google.com/profilename)
• logging into existing account using Google profile OpenID
• OpenID Selector module for logging into existing account

Here are the caveat:
New logins using OpenID did not create new account. My attempts to login were met with the message:

Complete the registration by filling out the form below.

Unfortunately, for said form...and for me, no form below to be found. I am using a custom theme, to which I've added a custom (very simple) maintenance page template. So at this point, I'm trying to figure out what variables and custom functions I need to add to get the registration working. No luck yet (and marginal incentive as there's other more pressing stuff to finish), but here are some links I'll be checking out when I have a moment:

• openid_authentication() function documentation
• Themeing Drupal 7 User Registration Form - from StackExchange's Drupal Answers
• Theming the Drupal 7 user registration form - from beyrent.net
• Customizing and Overriding User Login page, Register, and Password Reset in Drupal 6 and 7 - from d.o