I'm using WP 3.1.1 and Ata 3.6.4. I have dragged over the widgets I want in the right sidebar: Recent Posts, Archives, and Links (with "My Friends") the selected link category.
On the web page, above the desired link category, is a display of an unwanted link category, "About Me." It's displaying as a separate list, just as if I had dragged over an additional widget.
Lane