Strange behaviour of playback connection.

[xTrader1]

I was not able to see "playback real time" data in a chart until I used 1-tick data series .Neither historical data nor market replay data did not show real time chart , while Plaback control, in both modes showed the data is playing. Usually I am working on 1-minute chart , so I created new EURUSD , GBPUSD charts with 1 minute dataseries between dates when market replay data is available and expected real time update on the chart , but only my older historical data was shown.
As I said , I was not able to see the playback on the chart until I asked to load 1-tick data series on the chart. From this moment everything is OK incl. 1 minute chart.
I can send my logs, but only connecting/diconnecting/Simulation mode is logged, nothing unusual.

[xTrader1]

Seems to be solved. It happened, when I began my playback on Saturday , when there is no data. In this case previous , historic date , out of requested date range was displayed. When the playback begin on trading day, it seems to be ok , yest I must begin from tick data , only after the chart is populated by ticks I can define 1 minute in dataseries of the chart and then it plays properly.
I don't know whether this is an expected behavior of NT8.