First let me thank you for wonderful plugins, I wish I had more money to support you better.
this plugin is really great, for a long time I had a problem with it always accepting users even if they entered the wrong number with calc checks. I looked through the code and could find no problem, and after many hours of experimentation, I found it was because I am also running the Extrawatch component. When I disabled Extrawatch on the login page,it works. However, regular recaptcha works fine with extrawarch so there is some minor problem with the code which isnt that important to most users, so I am not asking for a fix. .
Now I have it working, though, I notice the first spam check fails exery time with calc check, even if the number is correct. I was wondering if you had encountered that before and know why.