I had this same problem with the latest version (2.6.5) and dug through the code to see what was firing when this list is formed. It turns out, I had CB Profile selected under "User Profile Integration" in the General tab of the Main Configuration (perhaps this is the default, as I don't remember setting it). I don't have CB installed but when my page rendered, the code thought I did and therefore couldn't find anything to display. I turned off integration and voila!