I've setup Tank Auth on Fedora Core 9, so far seems ok. However, even after giving write access to the Captcha folder, on my Register page, I'm being asked for a confirmation code. I don't see any captcha (local, not recaptcha) so clueless as to the code to enter.
As a temporary measure, I'm commenting out the lines in the register method that check for confirmation code or hard coding something.
Thanks again for what appears to be a very useful library!