It's a very simple task, and it should work no problem... are you sure Cron is properly installed in your image and running ? As I would bet this is not the case.

You can PM me or WarLord and I am sure we can find what is wrong as normally it should work fine.

TS
_________________________
DM8000, DM800se, DM500HD, DM800HD, DM7025, DM7020s, DM7000, DM500s
VU+ Solo, VU+ Uno, VU+ Duo, Kathrein UFS910
Tivusat, TNTSat, Fransat, SSR/TSR, BBC1-2-3/ITV
DE-OpenBlackHole 1.4 image : http://www.openblackhole.com/