Please report issues, fork, etc. from the GitHub repository: https://github.com/davidosomething/dko-openid-delegation
This plugin adds the relevant link and meta tags for OpenID server delegation to your WP_HEAD. See this MyOpenID page for more information.
If rewrite rules from a caching plugin, or custom rewrite rules, cause the page to do a 301 redirect, login will fail, at least for some sites. Remove these rewrites to fix it.