Error logging in at auth/sign_in page


All of a sudden, the past few days, any time anyone tries to log in from the auth/sign_in page, an error page is returned:

“Security verification failed. Are you blocking cookies?”

If the user then types in the root domain name, their session is logged in and seems to work fine.

Anyone know how to fix this? Tried upgrading to the most recent version of mastodon a few minutes ago, the upgrade worked fine…but we’re still seeing the same error at login.