PaulS:
I give up.
No surprise there. What I have said on more than one occasion is that I can't draw the lines. This means that, when I want the lines drawn, I try to draw lines, but I fail. I see nothing. Other than that, I obviously don't know what happens as there is nothing to see happening. I have also said that the lines may have been drawn, but off-screen. What I do know is is that the data required to draw the lines is in the right place and retrievable by other means. In the other instances, I do see lines and they are kosher - as clearly explained in the original post.