Wouldn't the "INIT OR xxx" take care of that?
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Buy:=Cross(RSI(14),30);
Sell:=Cross(70,RSI(14));
init:=Cum(IsDefined(Buy+Sell))=1;
short:=BarsSince(init OR sell)<BarsSince(init OR buy);
long:=BarsSince(init OR buy)<BarsSince(init OR sell);
flag:=long-short;
flag*(flag<>Ref(flag,-1));
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As "-1" and "+1" are used for signals, the undefined state would be "0", if I understand things correctly. Is that what you mean by "null" bars?
Since you mentioned it -- just what does your "Xtend.dll" do?
--Johnathan