I feel your pain! I had one old category that I could not find anything attached to that refused to leave the Touchdown list. I had decided to ignore it.... And then, because I hated to tell you that you were out of luck, I went back to the problem and had a flash of genius (modestly speaking, of course). My tasks are filtered to only show those that aren't complete. When I changed the filter to view all tasks, I found the completed tasks that were attached to that last pesky category. AND NOW IT IS GONE! I hope this helps you too. Thanks for giving me that last nudge to look again.