I am having the same problems. I am trying to contact the person that wrote the code and hope he will fix it.
The issue is with the https pages. The captcha will not show for some reason in Firefox. In IE8 I get a warning to show non-secure items on a warning bar across the top of the browser. So if I allow it then it will show.
This is why it shows on some of your pages. Check and see, the pages it shows on I bet are http pages.
I had to turn it off on my create account page as I had potential customers calling saying they couldn't create an account due they were getting a message that the security code was incorrect. They called and said they didn't even see the code. Needless to say this was impacting my business.
This is an awesome add-on and as soon as I find a fix I will respond back...
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