This has been the case for over a week.
I've tried deleting cookies, saved loca data and everything else but none of that makes a difference.
However, when I swtich my browser to mimic a mobile browser (developer mode, responsive view), the site suddenly allows me to log in, from the SAME BROWSER.
When I go back to desktop mode, it prevents me from logging in again. Just keeps presenting me with the same login screen.