Not sure if this is already reported or not.

Working on a skin, figured I'd do "Sidebar 2" for singles and page-types but I did it as "Sidebar2" and reloaded the skin. Got widgets in "Sidebar" and in "Sidebar 2" (which is silly because the container doesn't exist except in b2evo's mind), and of course nothing in "Sidebar2". So I edited the file to use the container name b2evo thinks is right. "Sidebar2" is gone from the skin but not gone from the widget page. Clearing pre-rendered cache didn't remove the phantom, nor did adding then deleting a widget.