No statistics/results for test

I recently am seeing the following happening:
I run a series of test runs (100).

My data log contains results for all 100 runs (0-99)

[grinder@ip-10-82-151-65 150911]$ more i-20ff63e6-1-data.log

Thread, Run, Test, Start time (ms since Epoch), Test time, Errors
0, 0, 8, 1441998741194, 166, 0
0, 1, 7, 1441998741363, 151, 0
0, 2, 4, 1441998741515, 56, 0
0, 3, 2, 1441998741573, 219, 0
0, 3, 3, 1441998741792, 68, 0
...

0, 96, 4, 1441998815931, 43, 0
0, 97, 7, 1441998815975, 156, 0
0, 98, 2, 1441998816131, 3928, 0
0, 98, 3, 1441998820059, 41, 0
0, 99, 4, 1441998820100, 52, 0


But the summary at the end of the worker log contains nothing:

2015-09-11 19:13:40,152 INFO  i-20ff63e6-1 thread-0: finished 100 runs
2015-09-11 19:13:40,155 INFO  i-20ff63e6-1 : elapsed time is 78966 ms
2015-09-11 19:13:40,155 INFO  i-20ff63e6-1 : Final statistics for this
process:
2015-09-11 19:13:40,162 INFO  i-20ff63e6-1 :

             Tests        Errors       Mean Test    Test Time    TPS

                                       Time (ms)    Standard

                                                    Deviation

                                                    (ms)


Totals       0            0            -            0.00         0.00



  Tests resulting in error only contribute to the Errors column.
  Statistics for individual tests can be found in the data file, including
  (possibly incomplete) statistics for erroneous tests. Composite tests
  are marked with () and not included in the totals.



Why would that be?  My test logic has not changed and my instrumentation of
record is identical in which I was previously getting results summary at
the end of the worker log.

Any insight would be great.

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