Summary of the bug : All the opponents cars were invisible ! But i still could see their lights on the ground, so they were not as stealthy as they thought.
Which version of Grip were you using :
When does this happen : At the beginning of the race, and during the whole race.
On which track did it happen : Figure 8.
On which speed did that happen (if related to physics) : Not speed related.
How often does this happen : It's the first time i see this.
How to replicate the steps (if reproducible) : Try to begin a race using the "bumper view" (the one Potty likes) maybe, that's the view i was on when the race started and the bug happened.
More details : At first i was like:
"where are the cars?" (i couldn't even see mine), then i pressed the down arrow on the gamepad and my car appeared, but the others remained invisible.
Your specs : GTX 970, i7 4790K @4GHz, 16Go RAM, Windows 7 family premium, game set on epic and 2175x1527
I made two screenshots of this: