"Active Plot" cannot be higher than the number of plots you actually have. You do a +1 twice for ActPlot, thus the first plot you select is #2 while you don't even have a plot yet. Also make sure the property node happens after data reached the x-y graph terminal.
--wire ActPlot directly to [i], the iteration terminal. The first plot is #0!
--add a +1 to [i] before wiring it to LegPlots (input there cannot be zero). If there is only plot zero, you want one legend visible, etc. right?
-- Leave "autosize legend" out, because it does not change. Either set it manually or set it with a property node once before entering the while loop.
-- The first ActPlot (read mode) is useless. Remove it.
See if this helps.
It is probably more efficient to attach th
e actual VI compared to a 1.3MB bitmap.
😉