The Reporter software does not start with a pre-defined list of categories, but builds this list up as it processes each access log. If none of your access logs have shown a category, it will not show in the drop down list as a category to filter on. In other words, some less uses categories, may never show in this list, because no one from your organization has visited a website with such a category.
To access your list, follow these steps:
Here is the list of categories from a single access log:
NOTE2: For a complete list of categories that Bluecoat Webfilter has, see BCWF.