From the admin screen, when I click on any of the links under the "Category" section I get the equivalent "Links" form instead. E.G. When I click on the add link under the Category section, the add "Link" form appears instead of the add "Category" form! That's basically what happens whenever I try to use any of the Category admin features, I get all the Link features instead.

Any ideas as to why this is happening would be greatly appreciated. Thanks.