Oh my apologies, I see from your log you are using firefox+linux.To cut a long story short, the measurement of latency while the test is running is suppressed for firefox+linux because originally it was associated with a graphics gauge, and firefox has terrible canvas performance on linux.
Anyway there isn't any reason to suppress latency measurements for this combination of browser+os, because I removed the gauge widget thing today.
thanks for persisting with it. Shortly it will do the latency thing while the test is running and will show in the result.