Created a TCP-E, scale 8 benchmark dataset. Ran Benchmark Factory with different number of user loads. It intermittently gives back no result - as all zeros on various statistics. I would then run another set, with smaller increment or just once off with the same user loads and I would get results back. It seems to happen to users load >= 15. The maximum I've tried is 30
The reason why there are no results may be due to the fact that no transactions are completing during the sampling phase.
For example Avg.Time for a few of the transactions are very high ( e.g. 236 seconds) and you are running with 1 min pre-sampling time and a 3 minute sampling. It is probable that the transactions are just not finishing and thus no results.
You might need to increase the sampling time, if the transactions take too long to complete and also you may need to tune the database to make the transactions run faster.