Developer Documentation has gone in xcode 3.2.5?

I used to looking up classes/methods from Help->Developer Documentation, which has API doc in local. But after I just upgraded my xcode to 3.2.5, it becomes totally different. When I type something in the search box (e.g. NSString), it accesses the network slowly a开发者_JS百科nd asks my developer account/password.

The even worse thing is after I type the password it keeps saying, "You Request Is Being Redirected: You may have used an outdated link or typed the address (URL) incorrectly. If you came to this page via a bookmark, please update it accordingly. "

What happened with it? How to get the old Developer Documentation back?

Happened to me with an earlier update, 2-3 versions before the official iOS 4.2 SDK. You can easily get it back from your Xcode preferences > Documentation (all the way to the right side)