I did not change one comma in the source.
The only thing, I can imagine is, that a "dcu"-File was in my lib, which I deleted. Maybe the error was in the code all the time, but I did not recognize.
However: I re-checked it all, everything looks as fitting together.
There are 2 kinds of scaling: "Candles" (=candlestick version of OHLC series)
and "baco" which are 3 values, 2 similar to each other and the zero-line.
Looks all ok.
It is Saturday in the evening, I worked all day, perhaps I am too tired to see something clear.
I will retry on Monday. If you have any more idea, I would be grateful.