I don't completely understand what's going on, but I suspect the culprit was the SmallBiz theme. I'd activated it for just a minute to check it out, but it appears when I deactivated it & activated Atahualpa instead, SmallBiz apparently left some stuff behind, creating several problems for me. I eventually wiped the slate clean - uninstalling & reinstalling WP & starting over. Now I have the fixed-width layout w/o problem. Maybe this info will help someone experiencing similar problems.
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