Confirmed… Mac Rhino is different than Windows Rhino.
Here is an updated version with a ‘reset to default’ choice, plus a better way to globally customize the grid contrast. In the script, if you modify the value of “step” at the top, you can change the overall contrast. Larger values=more contrast, smaller values= less contrast. I have it set at 15 by default, make it something like 10 if you want very subtle, or larger than 15 if you want the grid to pop more. I hard-coded the grid values for black background as the standard values are nearly invisible. I suppose I could make a sort of weighted multiplier based on value, but that’s too much work. Anyway, FWIW.
Edit: script updated, removed old one, download from post #18 further down…
Attention - @alain I am now getting instant crashes with the script on MacRhino 5.1. It works in the WIP, must be something 5.1 doesn’t like about the list box method… As soon as you pick something and OK, it crashes… Beware!
–Mitch