"Status 99" on NDMP jobs instead of queueing

NetBackup v. 7.5.0.5

I have a number of NDMP policies configured to backup NAS filesystems on an EMC Celerra.  The policies are configured with jobs/policy set to 4.  And 4 jobs *will* start when the policy is kicked off... but the other backup selections fail with a "Status 99"

The EMC jobs show the following:

2013-06-13 20:21:08: NDMP: 4: Session 431 (thread ndmp431) < Backup type: TAR >
2013-06-13 20:21:08: NDMP: 4: Session 431 (thread ndmp431) Name: TYPE Value: TAR
2013-06-13 20:21:08: NDMP: 4: Session 431 (thread ndmp431) Name: FILESYSTEM Value: /swint01p
2013-06-13 20:21:08: NDMP: 4: Session 431 (thread ndmp431) Name: PREFIX Value: /swint01p
2013-06-13 20:21:08: NDMP: 4: Session 431 (thread ndmp431) Name: LEVEL Value: 9
2013-06-13 20:21:08: NDMP: 4: Session 431 (thread ndmp431) Name: HIST Value: Y
2013-06-13 20:21:08: NDMP: 4: Session 431 (thread ndmp431) Name: UPDATE Value: y
2013-06-13 20:21:08: NDMP: 4: Session 431 (thread ndmp431) Name: OPTION Value: NT
2013-06-13 20:21:08: NDMP: 4: Session 431 (thread ndmp431) Name: SNAPSURE Value: Y
2013-06-13 20:21:08: NDMP: 3: Thread ndmp431 < Max allowed concurrent backup checkpoint is exceeded (count=5), try later >
2013-06-13 20:21:08: NDMP: 3: < LOG type: 2, msg_id: 0, entry: SnapSure file system creation fails, hasAssociatedMsg: 0, associatedMsgSeq: 0 >
2013-06-13 20:21:08: NDMP: 4: Session 431 (thread ndmp431) NdmpdData::startBackup, SnapSure creation for backup failed

Now my impression is that the policy should only start 4 jobs and the rest should queue up.  Instead of queueing they are all failing with "Status 99"...

Policy information:

------------------------------------------------------------

Policy Name:       NDMP-denpclrdm2-PRD01

  Policy Type:         NDMP
  Active:              yes
  Effective date:      02/03/1991 12:25:54
  Mult. Data Streams:  yes
  Client Encrypt:      no
  Checkpoint:          no
  Policy Priority:     1
  Max Jobs/Policy:     4
  Disaster Recovery:   0
  Collect BMR info:    no
  Residence:           DEN-DENSYM_ADV_PRD01-stu_disk_densyma01p-1y
  Volume Pool:         NetBackup
  Server Group:        *ANY*
  Keyword:             Production
  Data Classification:       -
  Residence is Storage Lifecycle Policy:    yes
  Application Discovery:      no
  Discovery Lifetime:      0 seconds
ASC Application and attributes: (none defined)

  Granular Restore Info:  no
  Ignore Client Direct:  no
Enable Metadata Indexing:  no
Index server name:  NULL
  Use Accelerator:  no
  HW/OS/Client:  NDMP          NDMP          denpclrdm2b

  Include:  SET DIRECT=Y
            SET HIST=Y
            SET OPTION=NT
            SET TYPE = TAR
            /ccstg01_ckpt0
            /ccstg02_ckpt0
            /ccstg03_ckpt0
            /ccstg05_ckpt0
            /svn02p_ckpt0
            SET SNAPSURE=Y
            /amm02p
            /aspen02p
            /docm02p
            /dtp02p
            /dtp03p
            /ecnt03p
            /fax01p
            /ora10p
            /scm01p
            /svn03p
            /swmil01p
            /swwork01p
            /swint01p

  Schedule:              full
    Type:                Full Backup
    Frequency:           every 25 days
    Maximum MPX:         1
    Synthetic:           0
    Checksum Change Detection: 0
    PFI Recovery:        0
    Retention Level:     0 (1 week)
    Number Copies:       1
    Fail on Error:       0
    Residence:           (specific storage unit not required)
    Volume Pool:         (same as policy volume pool)
    Server Group:        (same as specified for policy)
    Residence is Storage Lifecycle Policy:         0
    Schedule indexing:     0
    Daily Windows:
          Monday     19:00:00  -->  Tuesday    08:00:00

  Schedule:              incr
    Type:                Differential Incremental Backup
    Frequency:           every 1 day
    Maximum MPX:         1
    Synthetic:           0
    Checksum Change Detection: 0
    PFI Recovery:        0
    Retention Level:     0 (1 week)
    Number Copies:       1
    Fail on Error:       0
    Residence:           (specific storage unit not required)
    Volume Pool:         (same as policy volume pool)
    Server Group:        (same as specified for policy)
    Residence is Storage Lifecycle Policy:         0
    Schedule indexing:     0
    Daily Windows:
          Sunday     17:15:00  -->  Monday     08:00:00
          Monday     17:15:00  -->  Tuesday    08:00:00
          Tuesday    17:15:00  -->  Wednesday  08:00:00
          Wednesday  17:15:00  -->  Thursday   08:00:00
          Thursday   17:15:00  -->  Friday     08:00:00
          Friday     17:15:00  -->  Saturday   08:00:00
          Saturday   17:15:00  -->  Sunday     08:00:00

Anyone have any ideas?