Okay, I finally figured out how to create the "problem" . I knew if I poked long enough I could re-create it. If you move the divider lines either direction all the way over and then change to any other window and return to the Auction lots window, the divider bar is no longer draggable.
I do remember doing this a very very long time ago. Now, back to the drawing board. To try and remember how Thom had me fix it.