Additionally, I get an error when activating the plugin:
The plugin generated 972 characters of unexpected output during activation. If you notice “headers already sent” messages, problems with syndication feeds or other issues, try deactivating or removing this plugin.
Right now, I'm disabling the plugin when I need to do anything on the back end, then re-activating it when I'm finished. It doesn't seem to cause any ill effects on the public-facing side of the site.