plugin kills custom post type

Does this plugin not support subdirectory installs? I have a custom post type called "features" accessed at mysite.com/blog/features/ However I noticed yesterday that my features archive brings up the error 404 page, and same with the individual features. I have narrowed it down to this plugin - when I deactivate the plugin I am able to get my features back. Other blog posts and custom post types are not affected so I don't know if there is something about the term "features" specifically that is causing a conflict? What gives?