(Moodle 3.9.7, PHP 7.3.20) I have a strange case in which one teacher cannot add or edit assignment modules in any course. No error messages are generated, the settings page simply won't save. Other teachers do not have this problem. The permissions for this teacher are normal (same as for other teachers). Changing the teacher's role to Manager, does not solve the issue.
Have you any suggestions as to the cause of this issue, or what I should check?