DrawHorizontalGridLines = true;
DrawVerticalGridLines = true;
in OnStateChange()when State == State.SetDefaults and it works fine on our end, i.e., grid lines are unaffected when the indicator is added or removed.
However, a customer mentioned that he is having a problem where his grid lines disappear when he adds the indicator to a brand new chart. Basically, when the new chart is spawned the grid lines are there and after adding the indicator they disappear. Both our and the customer's NinjaTrader have the same version: 8.0.24.2 64-bit.
Any ideas on what causes this behavior? Any solution?

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