@ GaryK & JD45:
First thing - check to make sure you have the GD libraries installed - see
this post. If you don't have GD installed it won't work - if it is installed try this -
Check the structure of the images - they should be:
forum root/images/verification
Here's something to check if that is all correct, in templates check image_verification, and find this code:
PHP Code:
images/verification/show.php
Change it to your server root ie
PHP Code:
server root/forum/images/verification/show.php
Make sure that ?1 through to ?4 is kept after show.php otherwise it won't work.
If all else fails PM your site details and I can take a look.
HTH
Jason