Run: php admin/tool/task/cli/schedule_task.php --execute=\\core\\task\\plagiarism_cron_task It should work as before. Grep for plagiarism_cron() it should not find any occurrence Bonus1: Install a real plagiarism plugin, such https://moodle.org/plugins/plagiarism_vericite and make sure it still works as before. (requires cron execution using the command above). Bonus2: As a complementaty test, installing and enabling https://github.com/stronk7/moodle-plagiarism_dummypla should also allow you to verify that the plagiarism machinery continues working ok (this one is cron-less). Just create a couple of forum posts, one of the containing the "plagiarism" word and it will be detected.