Hi there! I am new to your forum and I am using Sketchup 2016 Pro and had this exact problem with 2015 Pro version. The problem is when I add color to a grouped object the black edge outline disappears making the detail difficult to see. I have spent over half a day total trying to resolve this. The black lines show up fine when the "All same" is selected. I then save the Style and it still retains the black edge and looks fine. If I wait for the Autosave feature to save the room or if I select it manually, the Color reverts back to "By material" every time and the edges disappear again. Do you have any idea how I could fix this?