Sue:
As always, thanks for the quick reply.
The settings are correct and the captcha file contains the correct content (at least the same as before the re-install).
Does it have to do with the GD library? Saw this in the php manual: “PHP is not limited to creating just HTML output. It can also be used to create and manipulate image files in a variety of different image formats, including gif, png, jpg, wbmp, and xpm. Even more convenient, PHP can output image streams directly to a browser. You will need to compile PHP with the GD library of image functions for this to work. GD and PHP may also require other libraries, depending on which image formats you want to work with.”