For Revit Architecture 2012. On the 2nd level, just before the floor and roof, I am trying to place a ceiling in 1 room that somehow is the only room in the entire level that is missing a ceiling. When I click in the room , no ceiling is placed there. Instead I get a magenta outline that is frozen and just to the outside of the magenta outline I get a red outline that highlights. I don't know what those 2 outlines mean. I am not sure what the correct sequence of commands are for placing a missing ceiling when the other rooms have ceilings on them. Does anyone know?