I also tried to remove a category with the same result as Uttam, then I tried Hugo's solution. I clicked on the category and selected "Delete" from the "Options" menu and the page went blank. Then, when I returned to the forum, the category was still there. The only difference now, I think, is that I can't post new threads to this category. How can I post new threads, or get the category to delete so I can start over?
Thanks very much!