It happend to me too
When I called IIO almost 2 1/2 months ago, She told me that my case
was assigned to an officer and I got an RFE. Within couple of weeks we
got a RFE for my Wife\'s Birth certificate, we responded and INS
received on 4/23/02.
Last week when I called NSC, IIO said my case was never assigned to an
officer, it was kind of strange and meaningless.