Being able to set the import dpi would probably be best. However, if Layout is expecting a certain resolution number consistently, I could adjust the output from AutoCAD as necessary. PNG images of black and white line work aren't very big so increasing the resolution would be OK for me.

Charlie, Thanks. That’s another way that’ll work. The info that comprises shadow information and the way it is stored suggests that unfixing the “fix” or making it optional shouldn’t be that hard to do. When one clicks on a different scene tab, SU should simply use the scene’s stored associated geographical/north arrow information as it did before rather than ignoring it.