Cannot run scheduled tasks

Hi

I cannot get Task Schudeler to run tasks when I am logged onto a domain. When I log on locally to the machine that contains the tasks, the tasks run fine. I have tried entering both my local administrative account and my domain account in the ‘Run As’ field, and have also tried leaving it blank. But as soon as I log on to the domain again, no tasks will run.

The computer is running WinXP SP1. The domain is controlled by a W2k server with Small Business Server installed over the top.
Can anyone help?