I've had a similar problem the last two installs (12.04 & 11.10). Prior to that since 7.04 there have been no issues.
Whatever I've tried to get crontab to work has failed, either via cli or in the GUI.
For instance, the present one I'd like to use is:
It will not start automatically. The commands work in Terminal both individually or with full path.
# m h dom mon dow command
59 01 * * * usr/bin/qbittorrent
01 08 * * * killall usr/bin/qbittorrent
It would be terrific if something obvious in the commands could be pointed out