Can't edit same stroke color and weight
I edit CAD files in Illustrator that are composed of various colored lines. Some of the colors I want to delete altogether (e.g. all green lines). Do do this, I select a green line then go to Select>Same>Stroke Color. Then all lines of that color are selected and I can either make them black or delete them all.
Recently when I try this, as soon as I move the cursor after selecting a line, the Appearance section in my Properties window disappears. Opening the Appearance window separately is no help. The same happens when I try this procedure to change the weight of all lines (Select>Same>Stroke Weight). Any suggestions?
