Falls die über Plesk 10 definierten Cronjobs nicht funktionieren, könnte das an folgender Einstellung liegen. Zitat aus dem Plesk Handbuch:
If you trust your customers enough to allow execution of scripts in a non-chrooted environment, then you can select the required shell by issuing the following command in the console:
# /usr/local/psa/bin/server_pref -u -crontab-secure-shell "/bin/sh"
If you want to revert this setting and set again the default shell used by the system, issue the following command in the console:
# /usr/local/psa/bin/server_pref -u -crontab-secure-shell ""
Diese Shell-Befehle funktionieren unter Plesk 10.4
Quelle: Plesk 10 Administrator Guide