This plugin generates a number of errors throughout the admin UI upon activation (I'm in development mode with WP_DEBUG on). The errors have to do with using deprecated user levels instead of roles and capabilities:
Notice: has_cap was called with an argument that is deprecated since version 2.0! Usage of user levels by plugins and themes is deprecated. Use roles and capabilities instead.
Looking at the plugin's code, it was not designed for roles and capabilities and needs to be updated. I would not recommend using this plugin until it has been updated to meet the needs of the latest WordPress.