We just switched to A26. When I place a door or window in a new wall it appears black. Seems like a graphic override or model view issue or something but I can't figure it out. Screenshot attached.

I've got site file that I then hotlink in several buildings. Usually this works fine, however, now the surface materials on the walls of the buildings aren't showing on the hotlinked modules. Slabs, roofs, etc. all the other elements seem to show the...