[amibroker] custom indicator not always displaying

["merrilldave" <dmerrill@xxxxxxx>]

hi, newbie here, thanks in advance for any help...

I've built a 2-line indicator that sometimes displays both lines, 
sometimes one, sometimes neither. when I open the editor and click 
Apply, often I'll see both lines display briefly, than one or both 
will vanish. when I mouse over the chart, often the ToolTip will show 
a value, plus two lines like this:
  (null) = {EMPTY}

I'm sure I'm making some basic beginner's mistake, but what's this 
all about?

here's the code:

---------------------
Graph0 = (MA(Stoch(21), 13) / 2) + (RSI(14) / 2);
Graph1 = (MA(Stoch(34), 21) / 2) + (RSI(14) / 2);
---------------------

thanks again,

Dave



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