There are just too many dots and lines in the default RWD captcha field. I've tried some of the suggestions here for reducing the noise and lines, but those were all 1.7CE edition solutions and I assume, 1.9.1 uses a different method, because nothing I've tried has worked.
I've tried changing and adding noise and line levels in the
/lib/Zend/Captcha/
But no results.
Any ideas?