Thread:Extension talk:OpenID/404: Page Not Found

I've been having trouble getting OpenID to work for my wiki, it's installed fine, displays fine, you get re-directed to the google/yahoo/etc login page fine, but once you've logged in and allowed access, the redirect back is to a 404: Page Not Found, which then causes the log in to fail.

The only thing I've been able to come up with is something like this: http://drupal.org/node/576270

But it doesn't seem to help me much as I'm not clear on what to do. Anyone else had this issue and resolved it?