This is also working OK.

Originally Posted by Ruben
As a quick test you have two background images for captcha.
background1.jpg
background2.jpg
One is I will call a smooth background and the other rough.
Whatever your path is to the two files you should be able to view them with your browser. That will at least tell you the files are there and okay.
So it would be like http://www.yoursite/forums/images/captcha/backgrounds/background1.jpg
This will at least test the image files. The letters images on the background are another thing.