Not urgent, wondered about it couple of times, but never thought to ask.
When doing Blendsrf, sometimes the preview gets all dark in render mode.
The surface in the inner-side seems ok.
Changed the direction of the surface using Dir but didn’t seem to affect it.
I’m not sure if I’m getting the same color infortation you are refering to…
Selected surface right click, properties. Then in the pop up under material, the layer color is set to white. Can’t click it though.
Using Dir I set the direction the same and also different, but still same.
Rendered mode is set as same as front face.
I’ll play around with the setting a bit more… in the mean time I’ll try to select the curves the other way around though the preview loses the meaning a bit…
Is this mac specific maybe?