You have light on ??
Open Design Director Palette, little bit down from Layear at the top of the palette, click on Light and this menu will open, is there open light there, as a yellow bulb, open Headligth and otr Ambient if not, not the eye, that only make it visible in Wireframe if you want adjust it somehow.
V20, V21, 2015/ 16/ 17/ 18/ 19 Pro. Platinum
Deluxe 2015/ 16/ 19
Windows 10 Home Premium 64 bit, 32 GB
NVIDIA Geforce GTX 780m, 1 GB