Unable to sign in using my Google account

When trying to log in to the main site with my Google account, I get a 431 Error.
I have to clear my cookies or launch a new incognito browser window to be able to get back to the login screen, but any subsequent login attempt (via Google) produces the same 431 error.

I seem to be able log into the forums ok though with my Google account.

Thanks for reporting this, I think we know how to fix it. Could you please submit a support ticket here with your account username/email address in the support ticket? https://demiplane.zendesk.com/hc/en-us/requests/new