Straight snap needs to be on, for the Golden Rectangle Script.
(I have not tried all of the snap combinations.)


(I normally leave all of the three yellow snap buttons on, most of the time.)

I assume you have the shortcut key set up. (I use Ctrl+Shft+G for the golden rectangle snap.)

Turn on Straight snap,
Select rectangle tool, and one corner point,
Hit the hotkey, combo,
Move the second point around by mouse, and a few Golden Rectangle snap lines will show up near the 1.618 side ratio,
then select next point on the dotted line.
(Labeling a square as Golden, I think is a very minor bug. IMHO)

- Brian