I've created a new Stack Exchange OpenID account (since it's not possible to change the e-mail address associated to an OpenID account).
When I tried to click on the link in the e-mail address validation message I got the "Ooops something went wrong" faceplanted panda. Trying to click the validation link again later lead to the "account already validated" page.
When I try to log-in with the new account, either directly or when linking it to my Stack Exchange profile, I again get the faceplanted panda.
Once — and only once — I got a different error message, something like "missing authentication parameter" (I don't remember the wording exactly and I never got it again).
I'm able to log-in correctly at https://openid.stackexchange.com/ but nowhere else.
I always close the browser and clean local data (cookies & co.) between tries.
Am I doing something wrong?
My new account ID is