Comment # 1 on bug 1198241 from Freek de Kruijf

The crontab for that non-root user has three items.
The first one should run each 5 minuted and does nothing. The second one should
run once per hour and does run. The third one should run once per month and has
not been activated yet.
I entered a fourth item to be run once per month, which happens after a few
minutes; this one did run.
Put the fourth one at the beginning and it did run. The second one is now the
each 5 minuted, which does nothing. Tried */5, 0-55/5 and 5,10,15,...,55 which
did not make any difference.