With IE6  was able to post questions in this discussion group. By this
discussion group I mean all discussion categories such as
the C# General Discussion.

Now that I have made the unfortunate, irreversible move to IE7 I have to
post from Opera or Firefox.

What happens is (although I am logged in) I am directed to the login page
when I post. After logging in I am returned to the discussion's posting list
and the "new question” posting form does not appear. Subsequent tries from
the same session continue to fail to bring up the posting form. The pop-up
blocker is off.