SCCAN network insiders – who have logins for their Spaces may have noticed login problems over the last couple of days.
We noticed this too and narrowed the problem down to our security certificate software. We escalated the problem to the software team in Holland and they had a fix, shortly after.
However the problem has recurred and is visible on other platforms which were also updated, so the software team sent us a development version of the software with a fix, but are still investigating.
The glitch can be rather transient, making it considerably harder for us to diagnose. If you do get the login error, essentially a blank screen and an invitation to DIY troubleshoot try adding /wp-login.php instead of wp-admin/ to your login url. And try a refresh several times. Please report to me if you experience any trouble, including whether or not the fix above works: