One last problem and then I think my transition is complete...
I've changed some of my category names (and slugs) to fit nice and neat in the cat nav bar.
This then removes the category posts from the columns (as it should).
So i go to select the new category for that column, and the new name is there, but no posts show when I select it.
Is there some table somewhere where the history of the column categories is stored that I can go clear?