Thread:Extension talk:CategoryTree/"no pages or subcategories" in 2nd level subcategory

I have a category, "Major Category," and a subcategory, "Minor Category." I've put the Major Category on the Minor Category page, and the Minor Category on a page. However, CategoryTree shows "no pages or subcategories" in the Minor Category. Any ideas on what to check? It looks like this, if you imagine the proper indentation.

[-] Major Category [-] Minor Category no pages or subcategories

Setup is:

MediaWiki 1.18 CategoryTree downloaded from extension page 3-January-2012