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When playing with the configuration I've been keeping another PC on the bench with its browser pointed to my site. Its not logged in, so I can see the site as seen by an "anonymous" user. Are you sure anonymous and registered users are seeing the same blocks? I can see the benefit of having control over this, but initially when configuring the site this difference can be "maddening"! Also have you looked on a different browser like Netscape, Opera or Mozilla?