Why would you tell people not to say that you've been IP banned? I'm not sure what being IP banned is like, but it could quite possibly have happened.
On the right hand side of that site, there's a massive list of proxies. Choose one, try and login. I've never tried logging in with a proxy, so I dunno what'll happen, but if something different happens, turn your modem off for 10 minutes or more, turn it back on, and your IP should be reset, so try again.