Gray areas when using raster or hybrid

[pipingguy]

I suppose there is no simple way to allow sketchup model objects that are painted semi-transparently to appear solid in layout when using raster or hybrid settings? The style used is hidden line.

What is the 'background' checkbox for in the styles tab of the model tray?

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hybrid causes gray areas.layout

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hybrid causes gray areas.skp

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hybrid causes gray areas.pdf

[pbacot]

At first I thought it was "seeing through" the back face of the bottom of the yellow box, but removing the face doesn't help. I don't know why the same pure color is not seen in LO, at the overhanging corners. Seems wrong that LO does not represent the SU view. Maybe there's another trick.