Afrow UK, thanks for your suggestion. At first I thought what you suggested did not work. But I was playing around with it, and found a very strange behavior.
When I make the changes you list, the view readme text line disappeared all together. However when I click outside of the Nullsoft window, on the desktop, then magically the line appears. I can also get just the box to appear if I click where I know it should be, see jpg. Moving the install window off my viewable desktop area, then back on resets the problem. What do you think?