Does your server has GD image library installed? Check with your host and if not ask them to install/enable it for you.

Have same problem. It was working for a long time and now stopped. Any issue?

Here is a reply of Support:

Hi there,

Yes, GD is enabled, you can see here :

http://yoursite.com/p.php

(search the page for 'GD' )

Please let us know if there is anything further we can do for you.


Best Regards

Do you have captcha on join page?

Please follow this tutorial: https://docs.oxwall.org/faq:captcha-troubleshooting
What do you see when you go here: http://yoursitename.com/base/captcha/

Quote from Oxwall Software What do you see when you go here: http://yoursitename.com/base/captcha/

This image has mistakes...
Now I will disable plug-ins one-by-one...

Join page captcha also was not working... All plugins off, but still same problem... I will bring all the plugins back. Can it be a problem, if I have another Oxwall site on subdomain? I use it for test.

Test site working well. Maybe I can copy security files and replace them?

I have tried everything. Captcha not working. http://seaclipper.info/base/captcha shows that image has some errors. But which errors? How to set it up? I will try to change theme...

Same story. No captcha... No any problems with .htaccess.

Yevhen, the errors are behind this image, you need to enable all possible kinds of error reportings on your server to see those errors, contact your provider to do so, then provide us with the errors so we could assist you.

Thanks! I will do.