The OJS has recently been upgraded from 2.4.8.
When attempting to add or modify a user I see: “Failed Ajax request or invalid JSON returned.”
accompanied with the following php log:
PHP Notice: Only variables should be assigned by reference in /var/www/html/lib/pkp/controllers/grid/settings/user/form/UserDetailsForm.inc.php on line 176
As far as I know the upgrade was successful:
bash-5.0# php tools/upgrade.php check
Code version: 3.1.2.1
Database version: 3.1.2.1
Latest version: 3.1.2.1
Your system is up-to-date