Here's something odd.
I had a category called "Need 2 Know" and using the category admin page, I moved it to be the child of another category. I wanted to change the name of the category ("Need to Know") but that's when I realized that it's not showing up in the list of the category admin page. It does not show up even if I search for it on that page... BUT, it still exists and is selectable when I write a post.
Just about the only thing I can completely guess is that it has a number in it and there's a bug somewhere in how categories get displayed. I didn't want to test that theory thinking I might end up with category I can't see to delete. Or, it could be some other issue.
Anyone ever have this problem?