It doesn't appear consistently, which is strange.

I do have to give Google credit for listening to the users of their
free news group service. When the Beta version was available to all
there were several bugs. I sent at least three emails and received a
cordial response that addressed the specific problem and assured that
they were working on the bugs. And those bugs are now gone.

I have found Google to be far more responsive to user problems than the
fee-based services like AOL or Compuserve ever were. And Google is
free.