cannot unsubscribe

Dear streettb:

I don’t think there is a issue with the plugin itself, unless someone else reports having the same problem. (it works on mine)

however, it can be to do with mysql user privilege, where is the db user you are using doesn’t have permission to DELETE, or if there is some linux config issues, or even wordpress config.

Try using the admin control in the admin page, and see if you can manually remove the user from the list.