Hi
I am having some issues with certain cars headlights not working during night/rain races making it almost impossible to play, here is an example.
It appears that sometimes quitting the game and then re-opening it will fix this, but it seems to be fairly random cars that are affected. I just tried the BMW Z4 GT3 and the lights were not lit up on the car select screen, after restarting the game selecting the same car in freeplay and the lights start working.
Specs
5820k
GTX 1070 Driver 385.69
32gb ram