Hey Will and Co,
since upgrading to WP2.5 and Open-ID 2.1.8, my openid users haven't been about to login or register.
After typing their OpenID name into the field, the code kicks in to authenticate them with their provider (? - forgive me if I'm not using all the terms right). The users can get to the screens that confirm access to be granted to my website, and then this error appears:
Fatal error: Call to undefined function: error() in /home/mitchell/public_html/blog/wp-content/plugins/openid/logic.php on line 653
Feel free to check it out on your own if you like, at mitchellirons.com/blog. No other plugins are loaded at the moment. I have also reverted back to a default WP theme.