Knowledge Base - No captcha images
"The captcha images are not drawn on my sobi2 entry form"
This is due because an another plugin is writting (outputing) anything other in the image draw process. To prevent this, simply change the plugins order, in the plugin manager of sobi2, and set the register plugin at first position.
Update: Since version 2.3.0 we have introduce a new method to draw the images, then the problem is solved.