I just upgraded to the latest version of Thematic and the Thematic Classic child theme, and in doing so I seem to have lost the ability to put widgets at the bottom of the page. I used to have three widgets arranged horizontally in the black bottom border of what was then the default Thematic look. I have tried adding widgets to the "Single Bottom" and "Page Bottom" sidebars, but nothing seems to happen in either case. When I add to the "Index Bottom" sidebar, the widgets appear inline with blog posts on my index page.
What am I doing wrong?