Re: Captcha image not displaying
Mark, welcome!
You need to use the full .htaccess provided by Tiki.
If it's not done automagically for you in your host, then you need to do it manually: rename your .htaccess file to something like .htaccess_host, and then, rename your _htaccess file (provided by Tiki) to .htaccess.
Otherwise, some features of Tiki may not work properly.
Cheers
Xavi