I have a site setup at http://www.blizzconphotos.com and a test site at http://test.blizzconphotos.com. I'm using CPG 1.4.19 and CAPTCHA 3.0.
Anyway, it works great for the comments, but not for registration. I tried to create a new user and always get the message that the code doesn't match, but the code was never displayed to begin with!
CAPTCHA is only installed on the test site. I am a web developer so getting my hands dirty isn't a problem in the code, but when I look at the codebase.php file everything looks as it should. Here is what I have in $CAPTCHA_DISABLE in the start function:
$CAPTCHA_DISABLE = array('register' => '',
'comment' => 'Administrators',
'report' => 'Administrators',
'ecard' => 'Administrators',
);
Registration worked as expected for me on http://www.blizzconphotos.com/ - I was told that I would get a registration confirmation email. But that email did not make it to the email address I provided. Check for yourself - the username I chose was "gaugau".
If it doesn't work for you, make sure that your browser doesn't auto-fill the input field.
Same to me after updating to version 1.4.19 from 1.4.18, captcha didn't appear in registration form, so it was impossible to register.
I find in this forum this topic which helps me and now it works fine.
http://forum.coppermine-gallery.net/index.php/topic,36319.msg225008.html#msg225008