Dots (DrawDot) not being displayed in the chart

[ds1111]

I'm coding an indicator that prints a dot on the high or low of a bar under certain conditions (e.g. SMA cross). For some reason, when I run the script, I can see the dot ONLY ONCE in the last few minutes.

As I go back in time no other 'dots' are being displayed.

I used a Print statement to confirm that a DrawDot was called in my code, and it shows in the Output window many times ("RED DOT ****"), but the dots don't display in the chart, although the code logic is correct and DrawDot is being called as confirmed by the Print statement just after it.

if (condition)
{
// Paint Red DOT
DrawDot("RedDot", true, 0, High[0] + 2 * TickSize, Color.Red);
Print("RED DOT ****");

}


Any clues?

Thanks.
PS: I"m new to Ninjascript.