It could to be a (paid) style issue, since in the register page shows a captcha correctly. Have you tried contacting its author?
You can set the default captcha plugin running the following SQL query (phpMyAdmin, pgAdmin, etc.):
Code: Select all
UPDATE phpbb_config SET config_value = 'core.captcha.plugins.gd' WHERE config_name = 'captcha_plugin';
After that you might need to purge the cache manually, that is, removing the
content of the
cache/production/
directory.
Note: The GD Captcha is broken, it provides no protection at all, so after login to the ACP, you'll need to change it.
Change
phpbb_
if your table prefix is different.