Jeremy - A frequently asked question...many past postings.

The TSM Problem Determination Guide has a section titled
"Troubleshooting the client scheduler", which leads you through steps.

Always keep in mind that the scheduler is serial: thus, if the
previously scheduled event has not completed for any reason (is still
active), then nothing further can be scheduled.

There is also topic      Scheduler "not working"
in http://people.bu.edu/rbs/ADSM.QuickFacts
or http://www.tsmwiki.com/tsmwiki .

   Richard Sims