Hi Lloyd, Could you check to see if pbs_sched is running. $ps aux | grep pbs_sched If it is kill it and try resubmitting your job. Can you send me your moab.cfg and the output of mdiag -r <RESERVATION NAME> -v Moab.33243 . So in your case mdiag -r linpack_benchmark -v Moab.33243. Thanks, --- Chris Vaughan