Couple notes:
-I am charting SPY but it happens with other symbols.
-As indicated in the thread, eSignal reports the last price as the previous close until the market opens. You can see this using the esignal watch list window.
-Esignal has another data field called "Last/ExtHrs" aka "Last/Extended Hours Last" which reports the true last price during pre-market (as well as during market). I believe if NT modified their code to use this field always it might fix the problem.
-Esignal charts chart the proper last price pre-market (as opposed to just charting the previous close as NT does)
-Interestingly, I have my session set to start at 8:30am EST and NT seems to chart the correct pre-market price until about 9:15am EST at which point it "flat-lines" until the open at 9:30am
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