If you have a lot of usergroups in your Joomla installation it occasionally happens that the backend plugin controls ‘save’ and ‘close’ are not working anymore.
Fir this to solve please increase the php limit max_input_vars in php.ini or add it as an override in your .htaccess
Please set a higher value, like:
Use in php.ini
max_input_vars = 5000
Use in .htaccess
php_value max_input_vars 5000
To speed up loading time of the plugin back-end usergroups are Joomla cached.
This means that, when adding a new group, you need to clear Joomla cache first before able to see the new list.
- Disable your template framework plugin and see if the issue persists.
- Disable any JQuery loading in your template and see if the issue persists.
Within Joomla versions 3.8.* there has been a change in the fieldform inclusion method which has been implemented but changed back. Some website frameworks adapted the change resulting in unexpected behaviour. It’s worth a try:
Go to: components/com_users/models/registration.php.
Do a search for:
$form = $this->getForm(array(), false);
$form = $this->getForm(array(), true);
This core hack should be re-applied every time Jooma is updated and the issue persists.