I was working on a project today where my client had this plugin installed but it was not functioning correctly with one of my plugins. While I was debugging this problem I discovered a bug in my plugin as well as one in the Custom Post Type UI plugin. The value for “Name” on the “Manage Custom Taxonomies” screen is not being propper filtered through sanitize_title_with_dashes(). This can cause trouble with rewritten urls for term views. Here's how you can recreate:
1. Set up a new post taxonomy with the following value for Taxonomy Name: “My Taxonomy with Spaces”. 2. Add some terms to the taxonomy and associate a few of these terms to a post. 3. Add the following code to your template file that displays single posts: