After the huge failure of "Better WordPress Security" update to "iThemes Security" I decided to try your security plugin. It seemed to work fine unless my colleague could not log in. After 2 attempts she was blocked, though I had set to 5 attempts in the plugin settings. Also, we notice that even other people cannot log in though we just created a new username and password. It's as if only the IP of the main admin / website creator could log in. If we disable your plugin, then my colleague can log in but not the developers at ManageWP.
Thanks in advance for your help.