I can't seem to log in with my Launchpad-provided OpenID (neither delegated via https://nullroute.eu.org/~grawity/, nor directly via https://launchpad.net/~grawity). After authenticating to Launchpad/UbuntuOne, I get redirected back to an error message:

Error: OpenID failure: naive_verify_failed_return: Direct contact invalidated ID provider response

However I've noticed that Launchpad OpenID works fine for other people.