This is fixed in the 1.217 test release in the link here: Max level/ headroom - #14 by matt
When the graph window is minimized, the graph width and height is zero, which is where the trouble originates.
Yes, @Var, you minimize the window as Claudio points out at 23 seconds. Not your fault, of course. But if you’d only shared the steps (and not the video) I’d not have caught it. So thanks for the time to make the video!