This one has me stumped!
I am using ArrayCopySeries to copy imported historical data and I get:
error 4074 ERR_NO_MEMORY_FOR_HISTORY
"SPX_Copied = ArrayCopySeries(SPX, MODE_LOW, "SPX500", 0); "
Also, to be able to access a Symbol via ArrayCopySeries() does the symbol need to be in the "File/New Chart" selection box?
I have never seen error like this, but regarding the other question - yes, you have to have the symbol listed in the Market Watch panel to access its charts. In addition, if the symbol chart for the particular period is not yet open, then the first call for data may return empty or incomplete result, as the data download gets triggered after its first request.