Check that your BPS Pro Activation Key is the correct Activation Key for this particular website. You can always request another Activation Key for a website if you are not sure if the unique Activation Key is correct for that particular website: http://forum.ait-pro.com/forums/topic/strange-behaviour/
If the Activation Key is correct for this particular website then reinstall BPS Pro using the BPS Pro built-in Upload Zip installer on the BPS Pro Install / Backup menu/page (Do NOT use the WordPress Upload zip installer).
FTP to your website and delete the /bulletproof-security plugin folder. Use the WordPress Upload zip installer to reinstall the bulletproof-security.zip file. You will not loose your settings by doing this. This is just reinstalling the BPS Pro plugin files.