I've attached one shot where you'll see ZS has stalled at one price after open...I tried re-loading but nothing happened.
I then opened up a new chart, same instrument, different timeframe (1 minute vs. tick charts).
You can see then that real data in the 1 min chart started loading, AND ZS on the tick chart immediately started populating again -
PS the ZS chart is in the lower center portion of the screen -

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