It's hard to tell without the drawing. Where exactly are you making this change to "colors"? If you're working in the Selection Info palette and change the Pen Color in the "Wall Style" section, this change will affect all walls that are assigned that Style.
The standard Lights are always set to Invisible. In the Design Director palette, click on the "Light" property. You should see a list of lights. Select them all, then click in the "Visible" column (eyeball) to make all the lights visible. When you did an initial render, the Point lights were placed where you were viewing from, but usually not the greatest location when going to other views.
Designer, Deluxe, (Professional, Expert, Basic), Platinum
Windows 10 Pro (1803), 64-bit