This is a response to your post, but also a reminder/suggestion in general.

This contribution, as initially stated, was done for a specific site so the categories are hidden from the modules/boxes/pages that the specific site used and ignored the ones that it didn't use. It is up to the user to find and fix... or eliminate... any page elements, sideboxes, etc that aren't used by this mod. Hints are provided in the readme. So in general, if you aren't up to snuff with PHP programming and aren't intimately familiar with zen cart, then my suggestion is you not use this contribution. It is probably more headache then it is ultimately worth to you.

If I had the time... and I don't... to do this contrib over again with more general use in mind (rather than just the site that was paying me) I would probably go about it entirely different, making use of the hooks available in recent zen versions if at all possible. With new major versions of Zen on the horizon... I doubt I'd undertake it even if I had the time (and I don't) until they were released and stable. I'm talking about zen v4 whenever it is ready, because it should give even better ways to interact with your data.

- Steven