i can see many comment message as spam and i have Captcha security for the comment on.
Are you shure your captcha is difficolt to read for automated system?
I think there is something wrong.
I don't want change plug in.. i hope you can improve the security Captcha. My level of Captcha security is set to Hard but is every time easy and i see comments spam.
Also i have see the captcha image is indicized by google.. is this right?
I hope you will fix the problem.