I had the same problem – only in firefox tho, chrome works fine.
I half-solved the problem by deleting wp-config.php from the server – when I tried to re-logon I had to go through the process of reentering the site configuration data.
Now I had ONE opportunity to log in via wp-login on firefox – only one, the next time I tried I had the same problem as before – I was stuck on the login page.
Quite annoying, is there any solution to this?
