Ask HN: What happened to logins?

I have always signed into HN using my Google account via ClickPass. Suddenly, when I try to login it wants me to either sign up again or already have an HN account...yet somehow, the page text mentions "Merging" my OpenID account, which makes me thing this is an attempt to connect my old account with a new one.

Does anyone know why this happened and how I get my account back?