AutoCAD Architecture

[#1]

I have a simple 3D drawing. When I plot it in paper space it plots properly after I set the viewport’s Shade Plot setting to “Hidden”.  When I xref the same file into another sheet however, the walls do not plot hidden in the viewport even though Shade Plot is set to “hidden” here as well.  Any clues as to why?

[#2]

I've seen a similar issue with the 3D Hidden setting. Resetting the 3D hidden setting back to defaults didn't resolve the issue, and I suspect it won't for Hidden either. Perhaps there is some obsure drawing based environment variable somewhere having an effect on this.

[#3]

Wblocking the entire drawing to a new drawing seems to resolve this issue for me. Maybe a corrupt drawings?