Wow,
Even you guys have exactly the same problem. Me too received my membership password and trading password today, and was trying to login today.
Anyways, here is what I tried and was able to login:
Click on "Proxy". From the dropdown, select any server, except from first 5. I had selected server-16. After selcteion, click on "Save". The the prompt automatically focuses on the login form. Fill your userid and password and then you can logon.
I had tried calling the "Customer Care", but it takes 5 min literally to get someone to answer.