Emergency, which files control category display

I just made some changes to 7 files for this addon:

http://www.zen-cart.com/forum/showthread.php?t=137248&page=2

Now, all categories with more than one item show NOTHING. Which document should I be looking at for the error?

/includes/templates/CUSTOM/templates/tpl_product_info_display.php

/includes/templates/CUSTOM/templates/tpl_index_product_list.php

/includes/languages/english/CUSTOM/product_info.php

/includes/languages/english/CUSTOM/index.php

/admin/includes/languages/english/categories.php

/admin/categories.php

/admin/includes/modules/category_product_listing.php

Can you give us the URL to your store?

Do you mean the category names don't appear or when you click on a category, there is nothing displayed in the center section?

http://nonelectronics.com/catalog

Nothing displays in the center area, categories are still on my sidebox.

I can still get at the items in the categories via other means, it's just the category listing in the center box that's broken.

Also, any categories with just ONE items show up fine.

The problem is with

/includes/templates/CUSTOM/templates/tpl_index_product_list.php

Reverting the changes fixed the category display issue.

I'm still trying to figure out how to implement password protection correctly... does anyone know which files control the display of items in the center area when you click on a category?