Martin,
I inadvertently set the log-in page to redirect to my profile at around 2pm, and it was like that until around 2.45pm. Which was a bit of a screw-up…
To make this more awkward, most web browsers cache web page redirections for around 24 hours. So, if you tried to log in with a particular browser while it was broken, you may continue to have trouble logging in for a little while.
In Firefox, you can fix this by going to History -> Clear recemt history…. If you delete your browser history from the past couple of hours, it’ll forget about the erroneous redirect. Or, if you do nothing, it should fix itself by tomorrow.
Sorry about that,
Dominic