Quote Originally Posted by schoolboy View Post
Dbltoe's module influences the behaviour of the categories tabs menu which appears in the HEADER section - not a sidebox. It looks like you are using a Pure_Black template (or one of the "Pure" series) and I think the headers of this template forcefully disable categories-tabs.

If you want to see a categories-tabs dropdown menu in action, GO HERE.
Thanks... that clears things up for me. I was after an addon that affected the category sidebox, rather than the header. I found one that works for my purposes called "CSS Flyout Menu." Thanks for the help!