It's a new "feature". But it's such a killer it's not even documented! Check out the TWSAPI yahoo user group for a discussion on this and some java code that will do autologins for you. SSB
I found a thread at hypertrader.com about how Hyperorder is not working with the last few versions of TWS. What is up with TWS and their changes? They always break things and you cannot use an old version of TWS, they won't log you in if you are 3 versions old.