[amibroker] Chart Signals Disappear when Interacting with Chart

[hjansenvanrensburg]

Hi,

I have noticed that chart signals sometimes disappear when I interact with the 
chart, e.g. when I click on it or scroll it.

Here is an example of a script where this problem occurs:

// Script Start

SetPositionSize(20, spsPercentOfEquity);
SetTradeDelays(1, 1, 1, 1);

BuyPrice = SellPrice = O;

HHP = 16;
LLP = 5;

HH = Ref(HHV(C, HHP), -1);
LL = Ref(LLV(C, LLP), -1);

Buy = Cross(C, LL) AND BarCount > 248 * 2;
Sell = Cross(HH, C);

Buy = ExRem(Buy, Sell);
Sell = ExRem(Sell, Buy);

Plot(HH, "HH", colorLightBlue, styleLine);
Plot(LL, "LL", colorLightOrange, styleLine);
PlotShapes(shapeUpArrow * Buy, colorBrightGreen);
PlotShapes(shapeDownArrow * Sell, colorRed

// Script End

Can anyone assist with this, please?

HNJ van Rensburg