I have run into an interesting issues after upgrading to WP 3.1.1. It seems something has broken the query_posts() functions ability to process the ‘cat’ parameter. Usual calls to: query_posts(“cat=1″); or to: query_posts(“cat=-1″); //exclude category 1 stopped working. It is interesting that only the ‘cat’ parameter is broken. The Hotfix plugin promises to address the [...]