Sorry about that, seems to be a security mesurement that gone haywire.
It's fixed now. (It banned IP's when they started to appear on multiple accounts, and then it mistakenly banned 172.16.0.254 - which is our gateway)
Thanks for addressing this. I'm able to log in now. But unfortunately I now get an Internal Server Error while trying to withdraw BTC :-(
I can't withdraw either. I don't get an error just a plain white page.