In 3.3 but I guess also in 3.2 when I have enabled b2evo caching, the captcha image plugin doesnt work correctly. The first time a post page is loaded, the captcha is displayed and the user can submit a comment all right. All subsequent visitors during the lifetime of the cached page cannot see the captcha image, not even reloading it.

In the plugin setup I have the expiration time for the images at 180 minutes, which is hgher than the Cache expiration time (120 minutes), but this does not help.

Any Ideas?