Hi -just updated bullet proof today and cannot log in to wordpress site. The message i get is: Login security solution: authenticate filter not called.
Do you have any other Login Security plugins activated/enabled? Turn Off BPS Login Security and see if the error goes away. If you have another Login Security plugin installed then you will have to choose to use that plugin or use Login Security in BPS. You cannot use both.
I assume that if you FTP to your website and rename the /plugins/bulletproof-security plugin folder then you should be able to log back into your site.