I’m using BPS Free and SI CAPTCHA Anti-Spam (SICAS) plugins.
When BPS and SICAS are both activated, BPS works fine, but SICAS does not. Specifically, SICAS displays a CAPTCHA image and the input box on the login page, but it does not block the login if the input code is wrong or blank! The login is allowed as if there were no CAPTCHA requirement at all.
When I deactivate BPS, suddenly SICAS works fine, and it blocks improper logins, improper CAPTCHA code inputs, etc.
So, something is happening when BPS is activated that is interfering with the operation of SI CAPTCHA Anti-Spam.
Yes, we are aware of this. What is happening is SI CAPTCHA Anti-Spam is using the same WordPress authenticate function that BPS is using on the Login page. Obviously 2 plugins cannot be trying to do the same or very similar things without there being some sort of competition/conflict. BPS overrides SI CAPTCHA Anti-Spam on the Login page and Registration to the site.
Your options are these:
Go to the SI CAPTCHA Anti-Spam settings page and uncheck CAPTCHA settings for Login and Registration.