Hi there,
I just had the same problem yesterday. My web host banned my IP for too many attempted wrong/incorrect/invalid POSTS of login information to wp-login.php within a short period of time, when all I was doing was customizing the look and feel of the login page using the plugin. For now I have been whitelisted, but there needs to be a longer-term solution.
I hope you will have an update for this soon.
Many thanks for your work on this plugin!