I was not able to create a new account on the new Gadgets site with my livejournal.com OpenID; I get this error from the authentication screen (after being redirected to LJ):
The site you just came from seems to want to verify an identity that you, as <LJ username>, cannot provide.
(I also have the same problem with a SE site that just started its private beta.)
(This is probably not related to my other problem, just filed with team@..., regarding not being on the private beta list when I should be.)
UPDATE: Livejournal OpenID logins are now working again.