Well, I didn't use captcha anymore on my forum and I was almost instantly flooded with spam, porn and other annoying threads. So, captcha does work. Now I've reinstalled but , but now new users can't register because captcha doesn't show.It's just a cross.
So how do I get captcha to work again? Thanks!

Did you try the mods in the post from my signature, http://ozzmodz.com/showthread.php/50...g-Spam-Is-Over

Check my answer to that question here https://vborg.vbsupport.ru/showpost....17&postcount=4

It works until it doesn't. Think about it - all the big email providers use it, but they still get bot signups and use of the accounts, by bots. You just haven't had the right botnet come along to hit you yet.

All it does even when working nicely is annoy legitimate people. It's obsolete. It's a cutesy gimmick that went the way of dialup.

Thanks everybody for taking the trouble to answer, but I only just want the captcha to work again. But nobody has said anything so far about how I can get the captcha to work again.
Apparantly, it does work for my forum. All I want to know is how do I fix the captcha.
What is wrong with it now? How do I fix it? Anybody got an answer to that?

http://www.google.com/recaptcha/intro/index.html
https://vborg.vbsupport.ru/showthread.php?t=294633

Yes someone did, Simon told you in post #4 a possibility.

Create a text file with the following codesave it as gdinfo.php, load it in your server then access it like www.mysite.com/gdinfo.php if you have gd library installed you'll get the message "it looks like GD is installed"

Thanks for that. I'm sorry I didn't see that. I'll look into that. :)