For some reason when I create a new surface, even if I duplicate the 'Exposure to light' parameters exactly of another surface, the resulting preview is always either glaring white, or pitch black
Below is a standard built in Archicad colour - preview is fine.
This is a colour I made by duplicating another colour (also with an ok preview)
Why is this?
How do I fix already defined new surfaces exhibiting this issue?
(I tried the workaround of duplicating and re-defining another colour not exhibiting the issue - but the result in the duplicate is always glaring white or pitch black preview - and same appears in the surface painter pallet, and neither bear any resemblance to the colour as displayed in 3D view )