Same here, That just started 2 days ago though.
1st - I got to let the site tell me wrong password by hitting just enter on log in - dont type user name or password yet, just hit enter ... next check the aways stay logged on button, next hit enter again ...
Same screen -
Then I can log in the normal way after all that ...
I use Maxthon browser but the normal IE does the same thing.
After I get the log part to look like this I can log on.
Try and see if that helps you WingedSerpent.
Update ... after doing that for 2 days I just did it the normal way again and now im ok ...
Maybe it was just a temporary thing?