v15 - Scheduled Utilities

Hi
We are testing scheduled reports in v15.0.6. It seems that reports are working fine (running and emailing as expected) but utilities are not working. When a utility is scheduled, it never runs. Nothing shows up in View Reports and in Maintain Report/Utility Schedule the Last Run Date stays at Never Run and the Next Run Date stays at No Future Run even though the time it was scheduled for has passed. Utilities work fine when running them manually so it seems to be something in the Scheduler. Two different user have tried with two different utilities (Manage Constituencies and Manage Special Activity) with the same (non)results. Has anyone else experienced this? Was there something in the Scheduler set up that we missed?
Thanks
Jess Levy
San Francisco Opera
415-551-6319