Plesk scheduler backup problem

[Katana]

Hello,

I'm having some problems with backup scheduler.
It's simply says "Running" (in scheduled tasks tab) but nothing happens. I'm not getting any errors during configuration of a scheduler and everything seems to be ok but when time comes for backup, I can see notification "Running" and it stays like that till I cancel it (I did cancel it after 24h and started backup manually).
When I start backup manually works without any problems. Time needed for manualy started backup is like 40mins so something must be wrong with scheduler.

Any ideas?

Plesk 8.2
Win 2003