First let me say how much I like this Captcha solution compared to others I've reviewed. I hope I do not have to find an alternative solution. Here's my problem:
I get users that reportedly cannot register on my site due to the Captcha always failing. If I stop and start my website (IIS 6 on W2K3 SBS), the issue is resolved. Any ideas for why this is happening?
Also, Firefox users are having difficulty registering due to failing the Captcha, however, they can then use IE to successfully pass the Captcha.
Any help would be greatly appreciated.