Hi Rich, that's a type of display artifact called "stippling" which can happen in various circumstances.

When MoI draws curves, it pulls them forward towards the eye point slightly so that they will draw on top surfaces that the curves are on.

It's difficult for the display engine to determine a perfect amount of "pull" without doing a lot of calculations that would slow down the display and if it isn't quite enough you will get that kind of display problem. When it pulls too much then it can get "bleed through" instead.

I have some ideas on how to improve that in the future but for now it's just something to ignore.

- Michael