Got exactly the same thing today.
It was fixed great all last night and this morning.
Also a problem on another domain hosted with you fraudbay.co.uk There I can't log in, it just keeps reverting to the home page. Same on other browsers.
I've got a ticket in but have a feeling it's being confused with the previous one.
Ignore that.....the fraudbay has just resolved. Still the Guz problem.