See my explanation about the precision issue in this case:
X length of l4 = 717900-717886 = 14 Number of pixels along X = 1200 X length of the axis = 1000000 l4 length in pixels = 14.*(1200./1000000.) = 0.0168000 pixels ...
so seeing nothing for l4 is normal in pixel mode. This line length is 1/100 pixel long…
The problem was that l4 was drawn as an horizontal line on the png file when the macro was ran in batch.
It was clearly a bug in TASIMage.cxx. It is now fixed in the master.