We just upgraded our WordPress Multi-site from 3.1 to 3.3.1.
I have already redone all the multi-site functions, upgraded the sub-sites, and re-did the permalinks.
Here's the problem:
The Category pages (using permalinks) are broken. If you go to a category page (using a WP-generated link), the page uses the blank index.php template. (It ignores the category.php template which is had used before the upgrade.) This page thinks it's pageID = 0.
Why do my category pages no longer think they are category pages?
Here's the link: http://www.teakwarehouse.com/teak/category/benches-outdoor/