I am having an issue with the visibility of filled regions in some views of my Revit model. Some views show the filled black region is visible, but in other views when I copy in or create a new filled solid black region it shows up blank/white instead. I have checked my VG settings, etc (detail items are turned on) and tried also turning off floors, roofs, etc. It is beyond me why it won't show up solid black in most of my plan views. I have tried changing the filled region to other fills such as concrete, etc and it seems to work but when I switch back to solid black it just shows up solid white instead! I have also tried editing the properties of the solid black filled region to make sure black is selected and switched between transparent or opaque but that doesn't do anything either. Is there some visibility setting that I am missing???